Only accept first parameter

[blakeembrey]

Matches util.MimeType behavior.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1a5a33d) to head (5479bf9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #67   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          120       122    +2     
  Branches        38        41    +3     
=========================================
+ Hits           120       122    +2     

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