Better bounds checking. Tried to make it and documentation comply with the conflicting style guides.
Added example of usage at the top of the module as well as warnings on usage.
Also fix the back() and internal englishOrdinal() proc from previous commit.
Added {.discardable.} pragma for .pop(), when calling only for it's side effects.
Sprinkled some unlikely() for optimization.
Some new tests reflecting those changes.
dac4826483