Squeak-dev February 2019

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The Trunk: Collections-topa.806.mcz
by commits＠source.squeak.org 13 Feb '19

13 Feb '19

Nicolas Cellier uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-topa.806.mcz ==================== Summary ==================== Name: Collections-topa.806 Author: topa Time: 12 September 2018, 3:28:40.687052 pm UUID: 46b95db5-a773-4113-92f0-5ee905404b49 Ancestors: Collections-cmm.805 Fix separators to include U+00A0 (no break space) Thanks Ron! =============== Diff against Collections-cmm.805 =============== Item was changed: ----- Method: Character class>>separators (in category 'instance creation') ----- separators + "Answer a collection of space-like separator characters. + Note that we do not consider spaces in >8bit code points yet. + " - "Answer a collection of the standard ASCII separator characters." + ^ #(9 "tab" - ^ #(32 "space" - 13 "cr" - 9 "tab" 10 "line feed" + 12 "form feed" + 13 "cr" + 32 "space" + 160 "non-breaking space, see Unicode Z general category") + collect: [:v | Character value: v] as: String + " To be considered: + 16r1680 OGHAM SPACE MARK + 16r2000 EN QUAD + 16r2001 EM QUAD + 16r2002 EN SPACE + 16r2003 EM SPACE + 16r2004 THREE-PER-EM SPACE + 16r2005 FOUR-PER-EM SPACE + 16r2006 SIX-PER-EM SPACE + 16r2007 FIGURE SPACE + 16r2008 PUNCTUATION SPACE + 16r2009 THIN SPACE + 16r200A HAIR SPACE + 16r2028 LINE SEPARATOR + 16r2029 PARAGRAPH SEPARATOR + 16r202F NARROW NO-BREAK SPACE + 16r205F MEDIUM MATHEMATICAL SPACE + 16r3000 IDEOGRAPHIC SPACE + "! - 12 "form feed") - collect: [:v | Character value: v] as: String! Item was changed: + (PackageInfo named: 'Collections') postscript: 'CharacterSet cleanUp: false.'! - (PackageInfo named: 'Collections') postscript: 'Character initializeClassificationTable'!

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The Trunk: Tools-jl.725.mcz
by commits＠source.squeak.org 13 Feb '19

13 Feb '19

Nicolas Cellier uploaded a new version of Tools to project The Trunk: http://source.squeak.org/trunk/Tools-jl.725.mcz ==================== Summary ==================== Name: Tools-jl.725 Author: jl Time: 1 September 2016, 3:38:08.183565 pm UUID: c1f63020-54e3-3d46-bef0-958eef4c73ae Ancestors: Tools-tfel.724 fixed project load dialog in etoys =============== Diff against Tools-tfel.724 =============== Item was changed: ----- Method: FileList2 class>>morphicViewProjectLoader2InWorld:reallyLoad:dirFilterType: (in category 'blue ui') ----- morphicViewProjectLoader2InWorld: aWorld reallyLoad: aBoolean dirFilterType: aSymbol | window aFileList buttons treePane textColor1 fileListPane pane2a pane2b treeExtent filesExtent | window := AlignmentMorphBob1 newColumn. window hResizing: #shrinkWrap; vResizing: #shrinkWrap. textColor1 := Color r: 0.742 g: 0.839 b: 1.0. + aFileList := self new. - aFileList := self new directory: FileDirectory default. aFileList optionalButtonSpecs: aFileList servicesForProjectLoader; fileSelectionBlock: ( aSymbol == #limitedSuperSwikiDirectoryList ifTrue: [ MessageSend receiver: self selector: #projectOnlySelectionMethod: ] ifFalse: [ self projectOnlySelectionBlock ] ); "dirSelectionBlock: self hideSqueakletDirectoryBlock;" modalView: window. + aFileList directory: FileDirectory default. window setProperty: #FileList toValue: aFileList; wrapCentering: #center; cellPositioning: #topCenter; borderWidth: 1; borderColor: (Color r: 0.9 g: 0.801 b: 0.2); useRoundedCorners. buttons := {{'OK'. Color lightGreen}. {'Cancel'. Color lightRed}} collect: [ :each | self blueButtonText: each first textColor: textColor1 color: each second inWindow: window ]. aWorld width < 800 ifTrue: [ treeExtent := 150@300. filesExtent := 350@300. ] ifFalse: [ + treeExtent := 350@500. + filesExtent := 550@500. - treeExtent := 250@300. - filesExtent := 350@300. ]. (treePane := aFileList morphicDirectoryTreePaneFiltered: aSymbol) extent: treeExtent; retractable: false; borderWidth: 0. fileListPane := aFileList morphicFileListPane extent: filesExtent; retractable: false; borderWidth: 0. window addARow: { window fancyText: 'Load A Project' translated font: Preferences standardEToysTitleFont color: textColor1 }; addARowCentered: { buttons first. (Morph new extent: 30@5) color: Color transparent. buttons second }; addARow: { window fancyText: 'Please select a project' translated font: Preferences standardEToysFont color: textColor1 }; addARow: { (window inAColumn: {(pane2a := window inARow: {window inAColumn: {treePane}}) useRoundedCorners; layoutInset: 0; borderWidth: 1; borderColor: (Color r: 0.6 g: 0.7 b: 1) }) layoutInset: 10. (window inAColumn: {(pane2b := window inARow: {window inAColumn: {fileListPane}}) useRoundedCorners; layoutInset: 0; borderWidth: 1; borderColor: (Color r: 0.6 g: 0.7 b: 1) }) layoutInset: 10. }. window fullBounds. window fillWithRamp: (Color r: 1 g: 0.85 b: 0.975) oriented: 0.65. pane2a fillWithRamp: (Color r: 0.85 g: 0.9 b: 1) oriented: (0.7 @ 0.35). pane2b fillWithRamp: (Color r: 0.85 g: 0.9 b: 1) oriented: (0.7 @ 0.35). " buttons do: [ :each | each fillWithRamp: ColorTheme current dialogButtonsRampOrColor oriented: (0.75 @ 0). ]. " buttons first on: #mouseUp send: (aBoolean ifTrue: [#okHitForProjectLoader] ifFalse: [#okHit]) to: aFileList. buttons second on: #mouseUp send: #cancelHit to: aFileList. aFileList postOpen. window position: aWorld topLeft + (aWorld extent - window extent // 2). window adoptPaneColor: (Color r: 0.548 g: 0.677 b: 1.0). window becomeModal. ^ window openInWorld: aWorld.!

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The Trunk: Collections-eem.803.mcz
by commits＠source.squeak.org 13 Feb '19

13 Feb '19

Nicolas Cellier uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-eem.803.mcz ==================== Summary ==================== Name: Collections-eem.803 Author: eem Time: 21 August 2018, 2:09:17.558296 pm UUID: 86665c06-0176-4eb8-b9dd-2b8dc3677fd6 Ancestors: Collections-dtl.802 More rational Dictionary>>fillFrom:with: so that collect:as: Dictionary matches e.g. Dictionary withAll: Since 2010 Dictionary withAll: { 2->3 } => a Dictionary(2->3 ). But 'abc' collect: [ :each | each -> each asciiValue ] as: Dictionary => a Dictionary(1->$a->97 2->$b->98 3->$c->99 ) With this change no tests appear to break (at least none that explicitly call collect:as:) and 'abc' collect: [ :each | each -> each asciiValue ] as: Dictionary => a Dictionary($a->97 $b->98 $c->99 ) =============== Diff against Collections-dtl.802 =============== Item was changed: ----- Method: Dictionary>>fillFrom:with: (in category 'private') ----- fillFrom: aCollection with: aBlock "Evaluate aBlock with each of aCollections's elements as the argument. Collect the resulting values into self. Answer self." + aCollection isSequenceable + ifTrue: + [aCollection associationsDo: + [ :element | self add: (aBlock value: element)]] + ifFalse: + [aCollection keysAndValuesDo: + [ :key :value | self at: key put: (aBlock value: value)]]! - aCollection keysAndValuesDo: [ :key :value | - self at: key put: (aBlock value: value) ]!

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The Trunk: Collections-ul.589.mcz
by commits＠source.squeak.org 13 Feb '19

13 Feb '19

Nicolas Cellier uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-ul.589.mcz ==================== Summary ==================== Name: Collections-ul.589 Author: ul Time: 17 December 2014, 3:31:06.906 pm UUID: 3f079add-7154-43c9-a265-bd59cb4cbcb8 Ancestors: Collections-bf.588 - Deprecated Collection class >> #randomForPicking. - Replaced all accesses to RandomForPicking with ThreadSafeRandom value. - WeakKeyDictionary >> associationsDo: ignores associations with GC'd keys. This affects all enumerator methods, and makes overriding #keysDo: unnecessary. - Added a new method SequenceableCollection #>> groupsDo:, which works like #groupsOf:atATimeDo:, but uses the block's argument count as the group size. Depends on Kernel-ul.891 =============== Diff against Collections-bf.588 =============== Item was changed: ----- Method: Collection class>>randomForPicking (in category 'private') ----- randomForPicking + + self deprecated: 'Use ThreadSafeRandom value instead. It''s not thread-safe to use this instance without the unaccessible MutexForPicking semaphore.'. ^ RandomForPicking! Item was changed: ----- Method: Collection>>atRandom (in category 'accessing') ----- atRandom + "Answer a random element of the receiver. Uses the process-local random number generator. Causes an error if self has no elements." - "Answer a random element of the receiver. Uses a shared random - number generator owned by class Collection. If you use this a lot, - define your own instance of Random and use #atRandom:. Causes - an error if self has no elements." + ^self atRandom: ThreadSafeRandom value - ^ self class mutexForPicking critical: [ - self atRandom: self class randomForPicking ] "Examples: #('one' 'or' 'the' 'other') atRandom (1 to: 10) atRandom 'Just pick one of these letters at random' atRandom #(3 7 4 9 21) asSet atRandom (just to show it also works for Sets) "! Item was added: + ----- Method: SequenceableCollection>>groupsDo: (in category 'enumerating') ----- + groupsDo: aBlock + "Evaluate aBlock with my elements taken n at a time, where n is the number of arguments of aBlock. Ignore any leftovers at the end." + + | index argumentArray numArgs endIndex | + numArgs := aBlock numArgs. + numArgs + caseOf: { + [ 0 ] -> [ ^self error: 'At least one block argument expected.' ]. + [ 1 ] -> [ ^self do: aBlock ]. + [ 2 ] -> [ ^self pairsDo: aBlock ] } + otherwise: []. + argumentArray := Array new: numArgs. + index := 1. + endIndex := self size - numArgs + 1. + [ index <= endIndex ] whileTrue: [ + argumentArray + replaceFrom: 1 + to: numArgs + with: self + startingAt: index. + aBlock valueWithArguments: argumentArray. + index := index + numArgs ].! Item was changed: ----- Method: SequenceableCollection>>shuffle (in category 'shuffling') ----- shuffle + ^self shuffleBy: ThreadSafeRandom value! - ^self shuffleBy: Collection randomForPicking! Item was changed: ----- Method: SequenceableCollection>>shuffled (in category 'copying') ----- shuffled + ^ self shuffledBy: ThreadSafeRandom value - ^ self shuffledBy: Collection randomForPicking "Examples: ($A to: $Z) shuffled "! Item was added: + ----- Method: WeakKeyDictionary>>associationsDo: (in category 'enumerating') ----- + associationsDo: aBlock + "Evaluate aBlock for each of the receiver's elements (key/value + associations)." + + tally = 0 ifTrue: [ ^self]. + 1 to: array size do: [ :index | + (array at: index) ifNotNil: [ :association | + association key ifNotNil: [ :key | "Don't let the key go away." + aBlock value: association ] ] ]! Item was removed: - ----- Method: WeakKeyDictionary>>keysDo: (in category 'enumerating') ----- - keysDo: aBlock - "Evaluate aBlock for each of the receiver's keys." - - self associationsDo: [ :association | - association key ifNotNil: [ :key | "Don't let the key go away" - aBlock value: key ] ].!

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The Trunk: GraphicsTests-nice.52.mcz
by commits＠source.squeak.org 12 Feb '19

12 Feb '19

Nicolas Cellier uploaded a new version of GraphicsTests to project The Trunk: http://source.squeak.org/trunk/GraphicsTests-nice.52.mcz ==================== Summary ==================== Name: GraphicsTests-nice.52 Author: nice Time: 12 February 2019, 11:59:21.898092 pm UUID: a952a9e4-3d82-45e8-b538-ff74679e9722 Ancestors: GraphicsTests-mt.51 Don't rely on Interval = Array. =============== Diff against GraphicsTests-mt.51 =============== Item was changed: ----- Method: CharacterScannerTest>>testBreakAnywhereWhenFirstCharDoesNotFit (in category 'testing') ----- testBreakAnywhereWhenFirstCharDoesNotFit | p text cbs | text := ((String new: 2 withAll: $m) , (String space) , (String new: 2 withAll: $m)) asText. p := NewParagraph new. p compose: text style: style from: 1 in: (0 @ 0 corner: mWidth-1 @ (style lineGrid * 7)). self assert: p lines size equals: text size + 1 description: 'Each character is on a new line, past end also'. + self assert: (p lines collect: #first) equals: (1 to: text size + 1) asArray description: 'Each character is on a new line'. - self assert: (p lines collect: #first) equals: (1 to: text size + 1) description: 'Each character is on a new line'. cbs := (1 to: text size + 1) collect: [:i | p characterBlockForIndex: i]. self assert: (cbs collect: #left as: Set) size = 1 description: 'Selecting before each character align on left' !

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The Trunk: CollectionsTests-nice.301.mcz
by commits＠source.squeak.org 12 Feb '19

12 Feb '19

Nicolas Cellier uploaded a new version of CollectionsTests to project The Trunk: http://source.squeak.org/trunk/CollectionsTests-nice.301.mcz ==================== Summary ==================== Name: CollectionsTests-nice.301 Author: nice Time: 12 February 2019, 11:58:26.442479 pm UUID: 503ca5fe-4b0e-451e-bdc6-f60410d5eb95 Ancestors: CollectionsTests-mt.300 Fix the Interval and RunArray tests now that they are not equal to themselves asArray. =============== Diff against CollectionsTests-mt.300 =============== Item was changed: ----- Method: IntervalTest>>testEquals (in category 'tests') ----- testEquals + self deny: (3 to: 5) = #(3 4 5). - self assert: #(3 4 5) equals: (3 to: 5). self deny: (3 to: 5) = #(3 5). self deny: (3 to: 5) = #(). + self deny: #(3 4 5) = (3 to: 5). - self assert: (3 to: 5) equals: #(3 4 5). self deny: #(3 5) = (3 to: 5). self deny: #() = (3 to: 5).! Item was removed: - ----- Method: IntervalTest>>testEquals2 (in category 'tests') ----- - testEquals2 - - self assert: (3 to: 5) = #(3 4 5). - self deny: (3 to: 5) = #(3 5). - self deny: (3 to: 5) = #(). - - self assert: #(3 4 5) = (3 to: 5). - self deny: #(3 5) = (3 to: 5). - self deny: #() = (3 to: 5).! Item was changed: ----- Method: IntervalTest>>testEquals4 (in category 'tests') ----- testEquals4 + self deny: (3 to: 5 by: 2) = #(3 5). - self assert: (3 to: 5 by: 2) = #(3 5). self deny: (3 to: 5 by: 2) = #(3 4 5). self deny: (3 to: 5 by: 2) = #(). + self deny: #(3 5) = (3 to: 5 by: 2). - self assert: #(3 5) = (3 to: 5 by: 2). self deny: #(3 4 5) = (3 to: 5 by: 2). self deny: #() = (3 to: 5 by: 2).! Item was removed: - ----- Method: IntervalTest>>testHashBug3380 (in category 'tests') ----- - testHashBug3380 - "Array and Interval equate, but their hashes didn't. Test that this is fixed. - It is about mantis bug http://bugs.squeak.org/view.php?id=6455" - | interval array | - interval := (1 to: 3). - array:= #(1 2 3). - self assert: interval equals: array. - self assert: interval hash equals: array hash.! Item was changed: ----- Method: IntervalTest>>testInvalid (in category 'tests') ----- testInvalid "empty, impossible ranges" + self assert: (1 to: 0) isEmpty. + self assert: (1 to: -1) isEmpty. + self assert: (-1 to: -2) isEmpty. + self assert: (1 to: 5 by: -1) isEmpty. - self assert: (1 to: 0) = #(). - self assert: (1 to: -1) = #(). - self assert: (-1 to: -2) = #(). - self assert: (1 to: 5 by: -1) = #(). "always contains only start value." + self assert: (1 to: 1) asArray = #(1). + self assert: (1 to: 5 by: 10) asArray = #(1). + self assert: (1 to: 0 by: -2) asArray = #(1). - self assert: (1 to: 1) = #(1). - self assert: (1 to: 5 by: 10) = #(1). - self assert: (1 to: 0 by: -2) = #(1). ! Item was changed: ----- Method: RunArrayTest>>testAtPut (in category 'tests - accessing') ----- testAtPut "self debug: #testAtPut" | array | array := RunArray new: 5 withAll: 2. array at: 3 put: 5. + self assert: array asArray = #(2 2 5 2 2). - self assert: array = #(2 2 5 2 2). array at: 1 put: 1. + self assert: array asArray = #(1 2 5 2 2).! - self assert: array = #(1 2 5 2 2).! Item was changed: ----- Method: RunArrayTest>>testNewFrom (in category 'tests - instance creation') ----- testNewFrom "self debug: #testNewFrom" | array | array := RunArray newFrom: #($a $b $b $b $b $c $c $a). self assert: array size = 8. + self assert: array asArray = #($a $b $b $b $b $c $c $a).! - self assert: array = #($a $b $b $b $b $c $c $a).! Item was changed: ----- Method: RunArrayTest>>testNewWithAll (in category 'tests - instance creation') ----- testNewWithAll "self debug: #testNewWithAll" | array | array := RunArray new: 5 withAll: 2. self assert: array size = 5. + self assert: array asArray = #(2 2 2 2 2)! - self assert: array = #(2 2 2 2 2)! Item was changed: ----- Method: RunArrayTest>>testRunsValues (in category 'tests - instance creation') ----- testRunsValues "self debug: #testRunsValues" | array | array := RunArray runs: #(1 4 2 1) values: #($a $b $c $a). self assert: array size = 8. + self assert: array asArray = #($a $b $b $b $b $c $c $a).! - self assert: array = #($a $b $b $b $b $c $c $a).!

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The Trunk: Collections-cbc.813.mcz
by commits＠source.squeak.org 12 Feb '19

12 Feb '19

Nicolas Cellier uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-cbc.813.mcz ==================== Summary ==================== Name: Collections-cbc.813 Author: cbc Time: 20 November 2018, 11:28:59.501218 am UUID: 78c08e62-a381-284a-b476-6e638d99f91d Ancestors: Collections-cbc.812 Altered Interval>>hash to increase entropy =============== Diff against Collections-cbc.812 =============== Item was changed: ----- Method: Interval>>hash (in category 'comparing') ----- hash "Hash is reimplemented because = is implemented." + ^((start hash hashMultiply bitXor: self last hash) hashMultiply + bitXor: self size)! - - ^(((start hash bitShift: 2) - bitOr: self last hash) - bitShift: 1) - bitOr: self size!

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The Trunk: Collections-cbc.812.mcz
by commits＠source.squeak.org 12 Feb '19

12 Feb '19

Nicolas Cellier uploaded a new version of Collections to project The Trunk: http://source.squeak.org/trunk/Collections-cbc.812.mcz ==================== Summary ==================== Name: Collections-cbc.812 Author: cbc Time: 15 November 2018, 10:06:05.244237 pm UUID: 1977358c-ec82-5442-8f1d-027d4bc817a3 Ancestors: Collections-eem.811 Make intervals that are #= have the same hash. Also, slight adjustment to #=. =============== Diff against Collections-eem.811 =============== Item was changed: ----- Method: Interval>>= (in category 'comparing') ----- = anObject - ^ self == anObject + or: [anObject isInterval + ifFalse: [super = anObject] + ifTrue: + [start = anObject first + and: [step = anObject increment + and: [self last = anObject last]]]]! - ifTrue: [true] - ifFalse: [anObject isInterval - ifTrue: [start = anObject first - and: [step = anObject increment - and: [self last = anObject last]]] - ifFalse: [super = anObject]]! Item was changed: ----- Method: Interval>>hash (in category 'comparing') ----- hash "Hash is reimplemented because = is implemented." ^(((start hash bitShift: 2) + bitOr: self last hash) - bitOr: stop hash) bitShift: 1) bitOr: self size!

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The Trunk: Kernel-nice.1213.mcz
by commits＠source.squeak.org 12 Feb '19

12 Feb '19

Nicolas Cellier uploaded a new version of Kernel to project The Trunk: http://source.squeak.org/trunk/Kernel-nice.1213.mcz ==================== Summary ==================== Name: Kernel-nice.1213 Author: nice Time: 8 February 2019, 11:24:45.054968 pm UUID: d7a472c9-49dd-4b1d-b73a-13b9c7c8d4c5 Ancestors: Kernel-tonyg.1212 Provide a logarithm in base 2: log2. This (x log2) has an additional property that (x log: 2) has not: it is exact for exact powers of 2. While implementing LogarithmicInterval, I recently wanted to use log: 2, and this was getting as bad as in Python. See https://stackoverflow.com/questions/931995/inaccurate-logarithm-in-python/5… I don't know if this feature is really worth it, but whether it ends up integrated or not, at least it demonstrates how easy it is to patch Squeak. =============== Diff against Kernel-tonyg.1212 =============== Item was added: + ----- Method: Float>>log2 (in category 'mathematical functions') ----- + log2 + "Answer the base 2 logarithm of the receiver. + Arrange to answer exact result in case of exact power of 2." + + ^ self significand ln / Ln2 + self exponent! Item was added: + ----- Method: Fraction>>log2 (in category 'mathematical functions') ----- + log2 + "This function is defined because super log might overflow." + | res | + self <= 0 ifTrue: [DomainError signal: 'log2 is only defined for x > 0']. + "Test self < 1 before converting to float in order to avoid precision loss due to gradual underflow." + numerator < denominator ifTrue: [^self reciprocal log2 negated]. + res := super log2. + res isFinite ifTrue: [^res]. + ^numerator log2 - denominator log2! Item was added: + ----- Method: Integer>>log2 (in category 'mathematical functions') ----- + log2 + self > 0 ifTrue: [^super log2]. + ^DomainError signal: 'log2 is only defined for x > 0'! Item was added: + ----- Method: LargeNegativeInteger>>log2 (in category 'mathematical functions') ----- + log2 + ^DomainError signal: 'log2 is only defined for x > 0'! Item was added: + ----- Method: LargePositiveInteger>>log2 (in category 'mathematical functions') ----- + log2 + "This function is defined because super log2 might overflow." + | res h | + res := super log2. + res isFinite ifTrue: [^res]. + h := self highBit. + ^h + (self / (1 << h)) asFloat log2! Item was added: + ----- Method: Number>>log2 (in category 'mathematical functions') ----- + log2 + "Answer the base-2 log of the receiver." + + ^self asFloat log2! Item was changed: ----- Method: Number>>log: (in category 'mathematical functions') ----- log: aNumber "Answer the log base aNumber of the receiver." + aNumber = 2 ifTrue: [^self log2]. ^self ln / aNumber ln! Item was added: + ----- Method: ScaledDecimal>>log2 (in category 'mathematical functions') ----- + log2 + "Unlike super, avoid Float overflow/underflow" + + ^self asFraction log2!

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Interval indexOf:startingAt: is fuzzy
by Nicolas Cellier 11 Feb '19

11 Feb '19

Hi, does anyone really need a fuzzy Interval indexOf:startingAt: ? Right now, we have this: ((0.1 to: 0.9 by: 0.1) indexOf: 0.3) = 3. ((0.1 to: 0.9 by: 0.1) includes: 0.3) = true. While this can sound nice, I don't think it is. No other collection behaves like that. ((0.1 to: 0.9 by: 0.1) asArray includes: 0.3) = false. ((0.1 to: 0.9 by: 0.1) asSet includes: 0.3) = false. Even Interval itself does not behave consitently: ((0.1 to: 0.9 by: 0.1) lastIndexOf: 0.3) = 0. ((0.1 to: 0.9 by: 0.1) occurrencesOf: 0.3) = 0. ((0.1 to: 0.9 by: 0.1) copyWithout: 0.3) = #(0.1 0.2 0.30000000000000004 0.4 0.5 0.6 0.7000000000000001 0.8 0.9). We have ScaledDecimal and Fraction which are less surprising, so IMO we should better use them when we really want to play with equality rather than trying to cheat with Float equality.

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