Fix enumerate of product

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #63 (a793d62) into master (93a247f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #63   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files           3        3           
  Lines         210      210           
=======================================
  Hits          198      198           
  Misses         12       12           

Flag	Coverage Δ
unittests	94.28% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/implementations.jl	93.87% <100.00%> (ø)

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