fixed ishalf

[SoongNoonien]

I think we need more tests for this. See #98

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.54%. Comparing base (8d23f70) to head (198d860).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/SumProc.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #148      +/-   ##
==========================================
+ Coverage   86.45%   86.54%   +0.09%     
==========================================
  Files          12       12              
  Lines         930      929       -1     
==========================================
  Hits          804      804              
+ Misses        126      125       -1     

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