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We have another instruction that is added to v8 for our performance experiments:
string.hash(str: string) -> int32, opcode0xfbaa- returns an implementation defined 32 bit hash value
The reasoning for this instruction is that any JavaScript engine already requires hashed strings, so with stringrefs there is already space reserved in the object for it and there are fast engine-internal implementations available handling different kinds of internal string representations etc.
Most languages require hashes for data structures and with stringrefs they can't add a hash property to strings, so keeping an application-defined hash together with the string is difficult / impacts performance.
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