[Cuis-dev] ifPresent/ifAbsent methods in SequenceableCollection (and other minimal improvements)

[Facundo Javier Gelatti]

In some work I'm doing, I needed to use the #at:ifPresent:ifAbsent: on
a SequenceableCollection, which I (wrongly) assumed was implemented (in a
similar way in which it is available for Dictionaries). A
SequenceableCollection only understands #at:ifAbsent:.

I'm not sure if we want to add them, but I attach some changes to add
#at:ifPresent: and #at:ifPresent:ifAbsent: to SequenceableCollection. The
changes are based on the current methods of SequenceableCollection
and Dictionary.

I also corrected the method comment on Dictionary>>#at:ifPresent:ifAbsent:,
and made minor style changes to SequenceableCollection>>#at:ifAbsent:.

Note: I didn't know if it was better to implement both #at:ifPresent:
and #at:ifAbsent: in terms of #at:ifPresent:ifAbsent:. I left them separate
because I saw that in Dictionary they are not implemented that way.

Cheers!
Facu
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