extensions/markdown-language-features/src/util/workspaceCache.ts/MdDocumentInfoCache/getForDocument
class MdDocumentInfoCache:	public async getForDocument(document: ITextDocument): Promise<T> {
		const existing = this._cache.get(document.uri);
		if (existing) {
			return existing;
		}
		return this.resetEntry(document).value;
	}