Improve fast type coverage

[mborland]

Fixes some bugs along the way as expected Closes: #668

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 99.72067% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.9%. Comparing base (b8761cc) to head (dd77132). Report is 2 commits behind head on develop.

Additional details and impacted files

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