Hi,

I have a test case like that:

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testIncrementBy

prefix := MyObject new numbers: #(1 10); yourself.

prefix incrementBy: 10.

self assert: prefix numbers equals: #(1 20).

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and the byte code starts like that:

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57 <40> pushLit: MyObject

58 <CC> send: new

59 <88> dup

60 <21> pushConstant: #(1 10)

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If I run the test case, it is green, but the byte code changes into:

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57 <40> pushLit: MyObject

58 <CC> send: new

59 <88> dup

60 <21> pushConstant: #(1 20)

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The #incrementBy: method looks like:

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incrementBy: aNumber

numbers at: 2 put: (numbers at: 2) + aNumber

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Is it correct that it also changes the method byte code?

I can put "#(1 10) copy�� into the test case.

I am just curious if it is a feature or bug.

Tested in Pharo4.0, Latest update: #40613.

Cheers,

Juraj