Guess JWS format with presence of Signatures instead of Payload

[lestrrat]

No description provided.

[codecov-commenter]

Codecov Report

Merging #431 (fb0a859) into main (f2758f9) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #431      +/-   ##
==========================================
+ Coverage   70.34%   70.36%   +0.02%     
==========================================
  Files          80       80              
  Lines        9233     9233              
==========================================
+ Hits         6495     6497       +2     
+ Misses       1884     1883       -1     
+ Partials      854      853       -1     

Impacted Files	Coverage Δ
format.go	84.61% <100.00%> (+7.69%)	⬆️

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