only works for composite fibers (function/class components)
checking if the constant is an integer and fits into i32::MAX, since the vm
，这一点在新收录的资料中也有详细论述
Two characters might have identical Unicode skeletons but render differently in specific fonts, or have different skeletons but render identically in a particular typeface. Detecting this requires rendering glyphs and comparing pixel output. No purely Unicode-data-based approach handles it, and UTS #39 does not attempt to.
新华社北京3月7日电 全国政协十四届四次会议7日下午在人民大会堂举行第二次全体会议。中共中央政治局常委、全国政协主席王沪宁出席会议。14位政协委员作大会发言。