fix: treat Object.prototype flag names as unknown options - #209
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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Flag names that collide with
Object.prototypemembers (--toString,--valueOf,--hasOwnProperty,--isPrototypeOf,--constructor, ...) were resolved through unguarded bracket lookups on thetypes,shorthandsandabbrevsmaps, so they returned inherited prototype functions instead ofundefined.resolveShortthen called.spliton that function and threwTypeError: shorthands[arg].split is not a function.This gates each of those map lookups on
hasOwn(and only readstypes[k]when the key is actually present) so such flags are handled like any other unknown option.--toString xnow parses to{ toString: true }withxleft inremain, matching--foobar x.References
Fixes #208