LATIN CAPITAL LETTER SHARP S
uc("ẞ") ⇒ "ẞ" (LATIN CAPITAL LETTER SHARP S)
lc("ẞ") ⇒ "ß" (LATIN SMALL LETTER SHARP S)
fc("ẞ") ⇒ "ss"
LATIN SMALL LETTER SHARP S
uc("ß") ⇒ "SS" ←
lc("ß") ⇒ "ß" (LATIN SMALL LETTER SHARP S)
fc("ß") ⇒ "ss"
uc("SS") ⇒ "SS"
lc("SS") ⇒ "ss"
fc("SS") ⇒ "ss"
uc("ss") ⇒ "SS"
lc("ss") ⇒ "ss"
fc("ss") ⇒ "ss"
If you reverse the uc and the lc, the two expressions will be equivalent for this example, but I don't know if it holds for all cases, and it's not something you should count on.
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