ucs2length.js
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ucs2length.js
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			'use strict';

			// https://mathiasbynens.be/notes/javascript-encoding
			// https://github.com/bestiejs/punycode.js - punycode.ucs2.decode
			module.exports = function ucs2length(str) {
			var length = 0
			, len = str.length
			, pos = 0
			, value;
			while (pos < len) {
			length++;
			value = str.charCodeAt(pos++);
			if (value >= 0xD800 && value <= 0xDBFF && pos < len) {
			// high surrogate, and there is a next character
			value = str.charCodeAt(pos);
			if ((value & 0xFC00) == 0xDC00) pos++; // low surrogate
			}
			}
			return length;
			};