extensions/markdown-language-features/src/markdownEngine.ts/TokenCache/tryGetCached
class TokenCache:	public tryGetCached(document: SkinnyTextDocument, config: MarkdownItConfig): Token[] | undefined {
		if (this.cachedDocument
			&& this.cachedDocument.uri.toString() === document.uri.toString()
			&& this.cachedDocument.version === document.version
			&& this.cachedDocument.config.breaks === config.breaks
			&& this.cachedDocument.config.linkify === config.linkify
		) {
			return this.tokens;
		}
		return undefined;
	}