Generalize datafit for unmatched times

[codecov[bot]]

Codecov Report

Merging #188 (c27ad85) into main (e6474d3) will decrease coverage by 6.21%. The diff coverage is 42.02%.

@@            Coverage Diff             @@
##             main     #188      +/-   ##
==========================================
- Coverage   79.33%   73.13%   -6.21%     
==========================================
  Files           7        7              
  Lines         363      428      +65     
==========================================
+ Hits          288      313      +25     
- Misses         75      115      +40     

Impacted Files	Coverage Δ
src/datafit.jl	59.67% <42.02%> (-21.68%)	:arrow_down:

... and 1 file with indirect coverage changes

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