(<DEGREE CELSIUS>): Use `=>decomposition@compat/unit' instead of

(<DEGREE CELSIUS>): Use `=>decomposition@compat/unit' instead of
`->decomposition'.
(J0-216E): Likewise.
(C1-2222): Omit `->decomposition'.
(<EULER CONSTANT>): Use `<-compat/math' instead of `->decomposition'
for <LATIN CAPITAL LETTER OPEN E>.
(<DEGREE FAHRENHEIT>): Use `=>decomposition@compat/unit' instead of
`->decomposition'.
(K0-2235): Likewise.
(<SERVICE MARK>): Use `=>decomposition@superscript' instead of
`->decomposition'.
(<TRADE MARK SIGN>): Use `=>decomposition@superscript' instead of
`->decomposition'.
(K0-2262): Omit `->decomposition'.
(<ALEF SYMBOL>): Use `<-compat/math' instead of `->decomposition' for
<HEBREW LETTER ALEF>.
(<BET SYMBOL>): Use `<-compat/math' instead of `->decomposition' for
<HEBREW LETTER BET>.
(<GIMEL SYMBOL>): Use `<-compat/math' instead of `->decomposition' for
<HEBREW LETTER GIMEL>.
(<DALET SYMBOL>): Use `<-compat/math' instead of `->decomposition' for
<HEBREW LETTER DALET>.
- Use `=>decomposition@compat' instead of `->decomposition' for
  compatibility decomposition mapping.
- Use `=decomposition' instead of `->decomposition'.
- Use `->canonical' instead of `=decomposition' for canonical mapping
  to single character.