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Node: cxx:Function:Luau.VM:VM/src/lstrlib.cpp:966:str_format
string.format — walk the format string, copying literals and dispatching
each % spec to the matching argument: %c/d/i/o/u/x/X/e/E/f/g/G go through
C snprintf with the scanned format (integer specs get an int64 length
modifier), %q quotes, %s formats or fast-paths long strings, %* appends
any value, and %% is a literal percent.