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rOACCT/node_modules/micromark/lib/util/normalize-identifier.js
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normalize-identifier.js
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			'use strict'

			var values = require('../character/values.js')

			function normalizeIdentifier(value) {
			return (
			value
			// Collapse Markdown whitespace.
			.replace(/[\t\n\r ]+/g, values.space)
			// Trim.
			.replace(/^ \| $/g, '')
			// Some characters are considered “uppercase”, but if their lowercase
			// counterpart is uppercased will result in a different uppercase
			// character.
			// Hence, to get that form, we perform both lower- and uppercase.
			// Upper case makes sure keys will not interact with default prototypal
			// methods: no object method is uppercase.
			.toLowerCase()
			.toUpperCase()
			)
			}

			module.exports = normalizeIdentifier