Adds Bidirectionality to Repeat
fix Issue 11780 - RangeError in format for incomplete format specifier
fix Issue 11403 - functions in std.algo can't be used as pred
Make std.container.Array assert.
Fix Take.back property
Take bidirectional unittest
std.regex: double 'l' in Cyrillic
Merge pull request #1834 from 9il/patch-2

std.regex: double 'l' in Cyrillic
Merge pull request #1631 from RommelVR/repeatbi

Adds Bidirectionality to Repeat
Remove dubious support for Unqual!R
Tweak blocks for consistency
Make internal attributes private
Tweak save implementation
tweak opDollar's DollarToken
new-style aliases
Use preconditions over asserts
rework slicing
Rework qualifiers in Cycle!Array
Use documented unittest in Repeat
Remove superfluous parens