MNT: Use direct operator evaluation rather than eval()

[greglucas]

We can get the dunder attribute for comparison which is faster than calling eval on the expression. Also clean up some of the uses of .values() in the comparisons.

Profiling

Goes from 1.25s in my test case to about 0.25s.
main

this branch

Checklist

• Changes are fully implemented without dangling issues or TODO items
• [n/a] Deprecated/superseded code is removed or marked with deprecation warning
• [n/a] Current dependencies have been properly specified and old dependencies removed
• [n/a] New code/functionality has accompanying tests and any old tests have been updated to match any new assumptions
• [n/a] The changelog.md has been updated

[medley56]

Awesome. Nice improvement here. eval is gross.