Allow input to start with slash by removing head slashes

[jdavidferreira]

• Allow input param to start with slash (/) by removing head slashes

[sindresorhus]

From the docs:

Leading slashes in input are disallowed when using this option to enforce consistency and avoid confusion about how the input URL is handled, given that input will not follow the normal URL resolution rules when prefixUrl is being used, which changes the meaning of a leading slash.

[jdavidferreira]

From the docs:

Leading slashes in input are disallowed when using this option to enforce consistency and avoid confusion about how the input URL is handled, given that input will not follow the normal URL resolution rules when prefixUrl is being used, which changes the meaning of a leading slash.

I see. Could it be something "discouraged", rather than something "disallowed"? From the little I saw, I don't see how this change could break things in the library. 🙈