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`Character.getNumericValue` has unexpected behaviour: it interprets A-Z as
base-36 digits with values 10-35, but also supports non-arabic numerals and
miscellaneous numeric unicode characters like ㊷. For example:
* `Character.getNumericValue('V' /* ASCII V */) == 31`
* `Character.getNumericValue('Ⅴ' /* U+2164, Roman numeral 5 */) == 5`
* `Character.getNumericValue('௧' /* U+0BF2, Tamil Digit One */) == 1`
* `Character.getNumericValue('௲' /* U+0BF2, Tamil Number One Thousand */) ==
1000`
* `Character.getNumericValue('㊷' /* U+32B7, Circled Number Forty Two */) ==
42`
[`UCharacter.getNumericValue`](https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/lang/UCharacter.html#getNumericValue-int-)
has the same behavior.
Consider using:
* [`UCharacter.getUnicodeNumericValue`](https://unicode-org.github.io/icu-docs/apidoc/released/icu4j/com/ibm/icu/lang/UCharacter.html#getUnicodeNumericValue-int-):
Handles all unicode codepoints with numeric values including fractions,
roman numerals, and other miscellaneous numeric characters. Returns the
value as a double. Does not assign a value to A-Z.
* [`Character.digit`](https://docs.oracle.com/javase/8/docs/api/java/lang/Character.html#digit-char-int-):
Handles unicode codepoints in the "decimal digit" category and the letters
A-Z which are interpreted as base-36 digits with values 10-35. Does not
handle characters like roman numerals and ㊷. You can use a `radix` value of
10 or less to avoid interpreting A-Z as digits.
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