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Revision 37584

array.c: speedup Array#unshift by using space in shared array

  • array.c: speedup Array#unshift by using space in shared array. [Feature #6638]
    • when array owns its shared array (ARY_SHARED_NUM == 1), and there is enough space then try unshift values directly into shared array.
    • when resulting array is big (~>64 items) then make it shared with enough room for future #unshifts, and then insert into shared array.