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/**
* Normalize an identifier (as found in references, definitions).
*
* Collapses markdown whitespace, trim, and then lower- and uppercase.
*
* Some characters are considered “uppercase”, such as U+03F4 (`ϴ`), but if their
* lowercase counterpart (U+03B8 (`θ`)) is uppercased will result in a different
* uppercase character (U+0398 (`Θ`)).
* So, to get a canonical form, we perform both lower- and uppercase.
*
* Using uppercase last makes sure keys will never interact with default
* prototypal values (such as `constructor`): nothing in the prototype of
* `Object` is uppercase.
*
* @param {string} value
* Identifier to normalize.
* @returns {string}
* Normalized identifier.
*/
export function normalizeIdentifier(value: string): string
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