Fix MIME type comparisons to be case-insensitive

[San9H0]

Description

The RegisterCodec function is public and takes the mimeType as a string. Therefore, it should compare values using strings.EqualFold.
In general, MIME type comparisons should be done in a case-insensitive manner.

Reference issue

Fixes #...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.72%. Comparing base (788147d) to head (3e2a804).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3085      +/-   ##
==========================================
- Coverage   78.74%   78.72%   -0.02%     
==========================================
  Files          91       91              
  Lines       11401    11401              
==========================================
- Hits         8978     8976       -2     
- Misses       1935     1937       +2     
  Partials      488      488              

Flag	Coverage Δ
go	80.62% <100.00%> (-0.02%)	⬇️
wasm	63.84% <ø> (ø)

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[Sean-Der]

This looks great to me @San9H0!

would you mind adding a simple test? Just to make sure no one breaks your fix

[San9H0]

Thanks for the review! I've added a test case to verify the case-insensitive MIME type comparison. Let me know if you need any changes.

[JoeTurki]

Thank you :)

[JoeTurki]

@San9H0 is it ready? :)

[San9H0]

OK. It's all done on my side. Let me know if anything else is needed

[3DRX]

Can we call strings.ToLower when MIME type is passed into media engine? Then internally it will always be lowercase and we don't have to worry about case insensitiveness. I'm thinking about this because if future changes adds more MIME type comparison, more tests on MIME type comparison needs to be added.

(Mistakenly closed this for a second because I hit the wrong button when I tried to comment, sorry about that)

[JoeTurki]

Can we call strings.ToLower when MIME type is passed into media engine? Then internally it will always be lowercase and we don't have to worry about case insensitiveness. I'm thinking about this because if future changes adds more MIME type comparison, more tests on MIME type comparison needs to be added.

I agree that would make much more sense

Edit: after tests, this would wouldn't be simple, sadly, it would break some things that rely on the current behavior, but we can do it later.