No way to discern between んよう or にょう when converting romaji to kana (Support for n')

[maesierra]

IE: kinyou could be both きにょう　or きんよう. When using IME that's not an issue because the typing is [k i n y o u] for きにょう and [k i n n y o u] for きんよう. But right now when using toHiragana "kinnyou" becames "きんにょ"
On romaji usually n' is used to mark a single ん when followed by a や/ゆ/よ

[vietqhoang]

This is a valid issue. I believe toHiragana is tied with IME function. Perhaps add another logic that will transliterate the n correctly and add an optional flag if toHiragana is being used for the IME? In other words, have toHiragana to default n' as single ん.