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24eeed65a2
This flag disables a very surprising and confusing feature I found in the code of wgetopt.rs: the ability to abbreviate the names of long options and the ability to parse long options with a single "-". This commit addresses #7341, but unlike pull request #11220, it does so in a backwards compatible way: one must use the new -S/--strict-longotps flag to disable the old legacy behaviour. Unlike pull request #11220 however, this flag only applies to ``argparse``, and not to any builtins used by fish. Note that forcing the flag -S/--strict-longotps on (i.e. in src/wgetopt.rs, replacing both uses of `self.strict_long_opts` with `true`), does not cause any of the current test cases to fail. However, third-party fish scripts may be depending on the current behaviour.