Cached fixnums for immediate values#9101
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This allocates and reuses the following values to avoid them being constructed repeatedly: * nil.__id__ and nil.hash * true.__id__ and true.hash * false.hash (false.__id__ is already cached as a zero RubyFixnum)
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* rubyString was the same deduplicated bytes and redundant. * symbolBytes was the same bytes but not deduplicated. * newShared predated fstring and was unnecessary for all uses. * getBytes can just use fstring's ByteList
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* int values and finals first * Lazily initialized values at end
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Cached fixnums for immediate values
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See #9096.