Fix method ambiguities

[codecov[bot]]

Codecov Report

Merging #228 (e5edd5b) into master (af9e9f9) will decrease coverage by 0.04%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
- Coverage   75.01%   74.97%   -0.05%     
==========================================
  Files          43       43              
  Lines        3054     3053       -1     
==========================================
- Hits         2291     2289       -2     
- Misses        763      764       +1     

Flag	Coverage Δ
unittests	74.97% <50.00%> (-0.05%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/system_data.jl	86.20% <ø> (ø)
src/validation.jl	11.32% <0.00%> (ø)
src/deterministic.jl	81.53% <100.00%> (ø)
src/probabilistic.jl	77.19% <100.00%> (ø)
src/scenarios.jl	83.67% <100.00%> (ø)
src/utils/utils.jl	60.33% <0.00%> (-0.43%)	:arrow_down:
src/utils/lazy_dict_from_iterator.jl	96.15% <0.00%> (-0.15%)	:arrow_down: