[Glass] Implementation Request in SmalltalkProxy

[Smalltalk via Glass]

Hi,

Installing Highcharts 6.0 for GemStone has dependency on Renoir package.
The installation script use Smalltalk globals at:ifPresent:ifAbsent:
See:
https://github.com/ba-st/RenoirSt/blob/master/source/BaselineOfRenoirSt/BaselineOfRenoirSt.class.st#L25

SmalltalkProxy does no implement at:ifPresent:ifAbsent:.
It will be good to have it. I already implement it as:
at: key ifPresent: oneArgBlock ifAbsent: absentBlock
     self at: key ifPresent: [ :v | ^oneArgBlock value: v ].
     ^absentBlock value

But it will be better if it is present in GemStone by default.

regards,
bruno


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