src/vs/base/common/json.ts/isWhitespace
function isWhitespace(ch: number): boolean {
	return ch === CharacterCodes.space || ch === CharacterCodes.tab || ch === CharacterCodes.verticalTab || ch === CharacterCodes.formFeed ||
		ch === CharacterCodes.nonBreakingSpace || ch === CharacterCodes.ogham || ch >= CharacterCodes.enQuad && ch <= CharacterCodes.zeroWidthSpace ||
		ch === CharacterCodes.narrowNoBreakSpace || ch === CharacterCodes.mathematicalSpace || ch === CharacterCodes.ideographicSpace || ch === CharacterCodes.byteOrderMark;
}