* Refine shape of the following characters:
  - ARMENIAN SMALL LETTER CHA (`U+0579`).
  - INFORMATION SOURCE (`U+2139`).
  - TRIANGLE-HEADED RIGHTWARDS ARROW (`U+279D`).
  - HEAVY TRIANGLE-HEADED RIGHTWARDS ARROW (`U+279E`).
  - DASH WITH UPTURN (`U+2E43`).
  - LATIN SMALL LETTER SCRIPT R WITH RING (`U+AB4C`).
  - MATHEMATICAL DOUBLE-STRUCK CAPITAL B (`U+1D539`).
* Add Characters:
  - LEFTWARDS DOUBLE DASH ARROW (`U+290C`) ... RIGHTWARDS TRIPLE DASH ARROW (`U+290F`).
