Improve performance of haskey lookups

[odow]

We call _info a lot. The previous code did a hash lookup twice. Once to checkin the key existed (the most common case), and then once to get the actual value. This simplifies the code to a single hash lookup.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.78%. Comparing base (1a4f551) to head (ea220b8).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #246   +/-   ##
=======================================
  Coverage   99.77%   99.78%           
=======================================
  Files           1        1           
  Lines        1352     1382   +30     
=======================================
+ Hits         1349     1379   +30     
  Misses          3        3           

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