BigInt const (Fixes 11148 and parts of 11188)
fix Issue 11392 - dirEntries segfaults
Fix error inpull 1679
More fixes for pull 1679
Fixed wrong placement of unittest in pull 1679
Merge pull request #1680 from WalterBright/fix11392

fix Issue 11392 - dirEntries segfaults
fix Issue 11401 - ElementType returns constructor instead of type

1. For `exp.member`, compiler always try to resolve property/optional parenthesis on `exp`. so use `front.init`.
2. Built-in `init` property always returns rvalue, so `front.init` won't invoke postblit.
Merge pull request #1681 from 9rnsr/fix11401

[REG2.065a] Issue 11401 - ElementType returns constructor instead of type
Fixed template constraints in biguintcore.
More fixes.
fix reg in appender
Fix Issue 11459 - std.container.Array bool constraint ambiguity
unittest and minor fixes
Merge pull request #1683 from monarchdodra/AppenderFixup

fix reg in appender
Merge pull request #1682 from monarchdodra/ArrayConstraint

Fix Issue 11459 - std.container.Array bool constraint ambiguity
Fix Issue 9737 - std.net.curl and SSL - documentation missing
Merge pull request #1687 from brocolis/fix9737

Fix Issue 9737 - std.net.curl and SSL - documentation missing
fix Issue 11489, add cast from const(LocalTime) to immutable
Merge pull request #1689 from 9rnsr/fix11489

fix Issue 11489, add cast from const(LocalTime) to immutable
Introduce package level `canSearchInCodeUnits`

And use it to solve bugs/simplify code.