Support to make a proc shareable #3700
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Isolated Proc prohibit to access outer local variables, but it was violated by binding and so on, so they should be error.
Shareable Proc objects are needed for several reasons, and Ractor.make_shareable(a_proc) creates a shareable Proc, which is more flexible than isolated Proc because it allows to read outer local variables. However, the proc can only see the snapshot of the snapshot which contains the values which are captured at the timing of Ractor.make_shareable(a_proc). All read-able objects are made sharable (~= deep frozen). [Feature #17284]
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This PR has two commits:
Ractor.make_shareable(a_proc).[Feature #17284]