refactor typehash lookup as while loop

[0age]

thanks to @Vectorized for the implementation!

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (436ce75) compared to base (e3e791e).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@            Coverage Diff            @@
##               1.3      #986   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         2671      2671           
  Branches       394       394           
=========================================
  Hits          2671      2671           

Flag	Coverage Δ
foundry	77.71% <ø> (ø)
production	100.00% <ø> (ø)
reference	100.00% <ø> (ø)

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

Impacted Files	Coverage Δ
contracts/lib/ConsiderationBase.sol	100.00% <ø> (ø)

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