"Ranges..." => "Needles..." in [starts|ends]With.
To avoid any confusion: The stuff in ranges may or may not actually be ranges. generic "Needles" is what best describes it.
Clean up endsWith unittests
Original author wrote "wrap" because filter is not bidirectional. However, the function filterBidirectional fits the need, so migrating to that.
Bit of unicode unittest in [starts|ends]With
Just sprinkling some tests. These covered a wee little bit of missing usecases.
Optimizations in startsWith
* Consolidate implementation by checking length in a single spot.
* Checks narrow string or the same types' lengths.
* Index iterates on all RA ranges (and not just Arrays).

Ends with was left untouched, because it forwards to startsWith anyways.
Optimization in startsWith(Range, Needles...)
Basically, makes it stop searching as soon as an element as matched.

This is an important optimization, that avoids a lot of startsWith's other "non-optimzations"...
Implement nextPermutation for bidirectional ranges.
Implement nextEvenPermutation.
Improve ddocs for nextPermutation and nextEvenPermutation.
Improve documentation.
Add unittests for non-default sorting order.
Fix rollover bug in nextEvenPermutation.
Add non-trivial example for nextEvenPermutation.
Oops, fix typo in ddoc.
support for non RA with length in startWith

As suggested by Andrei.

Also: More unittests
Correction of setIntersection's description in the cheat sheet.

setIntersection's description was the same as setDifference's, which 
seemed like an error, I think I fixed it.
Extra doc and tests for hasElaborateAssign
fix Issue 9199 - Module level qualified functions should be rejected

`inout` had qualified the function itself, rather than its return type.
Fixes Issue 9269 - Remove import to curl to avoid unittest build failure.
Fixes Issue 9339 - Uniform for enums.
Fixes Issue 8143 - Safe std.conv.to enum conversion