Explicitely call Base.fld

[jaakkor2]

Fixes #190

[vchuravy]

That probably goes for all methods being called here, sometime I just do a $func to resolve it to func at the definition time of the macro and not the evaluation point.

[codecov]

Codecov Report

Merging #191 (1723b2a) into master (5df4174) will increase coverage by 3.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   86.37%   89.68%   +3.30%     
==========================================
  Files           6        6              
  Lines         624      921     +297     
==========================================
+ Hits          539      826     +287     
- Misses         85       95      +10     

Impacted Files	Coverage Δ
src/execution.jl	97.43% <100.00%> (+0.54%)	⬆️
src/serialization.jl	95.74% <0.00%> (-4.26%)	⬇️
src/groups.jl	95.95% <0.00%> (-0.25%)	⬇️
src/trials.jl	71.15% <0.00%> (+3.60%)	⬆️
src/parameters.jl	64.70% <0.00%> (+4.70%)	⬆️

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