Change the way embedded strings move across ractors #9993
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When an embedded string was moved across ractors previously, parts of the embedded string would not appear correctly after 16 bytes. Now the string object is duplicated with `rb_str_dup` instead of relying on `rb_obj_alloc` and setting the generic RVALUE fields. [Bug #20271]
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When an embedded string was moved across ractors previously, parts of the embedded string would not appear correctly after 16 bytes. Now the string object is duplicated with
rb_str_dupinstead of relying onrb_obj_allocand setting the generic RVALUE fields.[Bug #20271]