Add more @nospecialize to function signatures.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.40%. Comparing base (503a4c5) to head (9225414).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/common_options.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1966      +/-   ##
==========================================
+ Coverage   85.03%   85.40%   +0.37%     
==========================================
  Files         189      190       +1     
  Lines       28087    28453     +366     
==========================================
+ Hits        23884    24301     +417     
+ Misses       4203     4152      -51     

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