in src/behaviors/emoji/support/is_emoji_unicode_supported.js [46:53]
function isHorceRacingSkinToneComboEmoji(emojiUnicode) {
const firstCharacter = Array.from(emojiUnicode)[0];
return (
firstCharacter &&
firstCharacter.codePointAt(0) === horseRacingCodePoint &&
isSkinToneComboEmoji(emojiUnicode)
);
}