WL: Merge in `mimetype_isa` from Role::MimeInfo? about file-mimeinfo HOT 2 OPEN

In my opinion a third parameter to mimetype_isa would be a nice option.

Can you give a few examples of actual parameters and their result to this function?

We then could also use those for the documentation.

from file-mimeinfo.

The proposal is to change the behaviour of mimetype_isa to try harder to answer whether type A isa type B, so the third option would just be a flag to turn that on:

# recursion
mimetype_isa('application/xhtml+xml', 'text/plain'); # false
mimetype_isa('application/xhtml+xml', 'text/plain', 1); # true

# aliases
mimetype_isa('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/x-zip-compressed'); # false
mimetype_isa('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/x-zip-compressed', 1); # true

This is the default behaviour of the wrapper I wrote in Role::MimeInfo. I wrote that thing because I found myself writing the same routines over and over with File::MimeInfo to normalize content types (e.g. from the wild) and compare them recursively.

One use case in particular is testing a claimed MIME type (e.g. from a Content-Type header or derived from a file extension) against the contents of a file or HTTP upload to see if the claimed type is at least as specific as the detected one. I do this in my own work in a number of places.

It makes sense that this functionality be universal and not just in a Moo(se) role, but of course there are probably systems that depend on the current behaviour of mimetype_isa exactly as it is.

from file-mimeinfo.