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				return '&' + encodeMap[string] + ';';
			});
		} else {
			// Encode `<>"'&` using hexadecimal escapes, now that they’re not handled
			// using named character references.
			string = string.replace(regexEscape, hexEscape);
		}
		return string
			// Encode astral symbols.
			.replace(regexAstralSymbols, function($0) {
				// http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
				var high = $0.charCodeAt(0);
				var low = $0.charCodeAt(1);
				var codePoint = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
				return '&#x' + codePoint.toString(16).toUpperCase() + ';';
			})
			// Encode any remaining BMP symbols that are not printable ASCII symbols
			// using a hexadecimal escape.
			.replace(regexBmpWhitelist, hexEscape);
	};
	// Expose default options (so they can be overridden globally).