18652: Improves performance by reducing lock contention via immediate return values, fixes rare bugs #47
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Adds ability for opcodes to return immediate types directly on the stack instead of having to allocate memory, reducing lock contention, improving performance.
Fixes some rare bugs, especially around calling concat or substr with only a single parameter which needed to be interpreted, and incorrectly was not.
Improves code consistency for opcodes to reduce likelihood of errors.