* pr/15473:
  Optimize StringSequence

Closes gh-15473

* pr/15438:
  Polish "Fix StringSequence.equals() for different lengths"
  Replace anonymous inner class with lambda

Closes gh-15438

See gh-15438

Closes gh-15535

This reverts commit f9ce6c9d.

See gh-15505

Closes gh-15532

See gh-15531

See gh-15530

See gh-15529

See gh-15528

Closes gh-15239

Closes gh-15518

Closes gh-15517

Closes gh-15516

Closes gh-15515

Closes gh-15514

Closes gh-15513

Closes gh-15512

Closes gh-15511

Closes gh-15510

Closes gh-15509

Closes gh-15508

Closes gh-15507

Closes gh-15506

Closes gh-15505

Closes gh-15504

Closes gh-15503