🚴 perf(cache): Avoid trashing the GC in rare cases.

Author: make-github-pseudonymous-again

src/0-core/measure/cache.js

@@ -1,5 +1,12 @@
 import {CachedMeasure} from './index.js';
 
+const CACHE = new WeakMap();
+
 export function cache(M) {
-	return M instanceof CachedMeasure ? M : new CachedMeasure(M);
+	if (CACHE.has(M)) return CACHE.get(M);
+
+	const cM = new CachedMeasure(M);
+	CACHE.set(M, cM);
+	CACHE.set(cM, cM);
+	return cM;
 }