Improve type safety of URLPattern args #105
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This makes the types closer to the behavior of the polyfill and the Chrome implementation by using a discriminated union to determine if the second arg is allowed, and then sharing the args between methods in a tuple type.
Note that this is a breaking change for TypeScript users, as I wanted to get rid of
URLPatternInput
to improve type safety. If possible, I'd recommend a major release for this.