Controlled inputs meta problem

[Deraen]

Combining controlled input problems from multiple older issues into one.

1. Problems with Unicode characters Korean input broken on :input and :textarea #587 reagent render Input dosen't support Chinse and cursor doesn't perform well #444
   I haven't investigated this much, but it is likely this due to input workaround counting the characters and Unicode chars being counted incorrectly for some charsets
2. Problems with React Native reagent render Input dosen't support Chinse and cursor doesn't perform well #444
3. Possible problem with input workaround inside shadow root Controlled input loses cursor under ShadowRoot in React 18 #597 (not investigated)
4. Certain input types (email, number) can't use the workaround because the Selection API isn't available or blocked; only fix is to remove the workaround. Controlled input loses cursor with React 18 when input type is :email or :number #609
5. Input workaround might cause problems with cursor disappearing The cursor disappears at the end of a controlled input on Chrome #595

Possible fixes: #504 (would remove the need for the workaround)