Incorrect width for zhuyin tone marks

[acarl005]

Thanks for this library. I am building a typing speed training game for Zhuyin (注音) input and this will be convenient.

The tone marks from Zhuyin input are incorrectly having a length of 2 when they should be 1.

const eaw = require("eastasianwidth")

eaw.characterLength("ˋ") // 2
eaw.characterLength("ˇ") // 2
eaw.characterLength("˙") // 2
eaw.characterLength("ˊ") // 2

[seachicken]

Using icu4j, all these characters are ambiguous, so 2 is correct.

System.out.println(UCharacter.getIntPropertyValue('ˋ', UProperty.EAST_ASIAN_WIDTH)); // UCharacter.EastAsianWidth.AMBIGUOUS;
System.out.println(UCharacter.getIntPropertyValue('ˇ', UProperty.EAST_ASIAN_WIDTH)); // UCharacter.EastAsianWidth.AMBIGUOUS;
System.out.println(UCharacter.getIntPropertyValue('˙', UProperty.EAST_ASIAN_WIDTH)); // UCharacter.EastAsianWidth.AMBIGUOUS;
System.out.println(UCharacter.getIntPropertyValue('ˊ', UProperty.EAST_ASIAN_WIDTH)); // UCharacter.EastAsianWidth.AMBIGUOUS;

If you want 1, you can use eastAsianWidth to determine if 'A' is 1.
Sample implementation: power-assert-util-string-width