Thanks very interesting !

About Typeface memory leak, I think it was fixed with Android 7.0.

From the SDK source code :

public static Typeface createFromAsset(AssetManager mgr, String path) {
    if (sFallbackFonts != null) {
        synchronized (sDynamicTypefaceCache) {
            final String key = createAssetUid(mgr, path);
            Typeface typeface = sDynamicTypefaceCache.get(key);
            if (typeface != null) return typeface;

            FontFamily fontFamily = new FontFamily();
            if (fontFamily.addFontFromAsset(mgr, path)) {
                FontFamily[] families = { fontFamily };
                typeface = createFromFamiliesWithDefault(families);
                sDynamicTypefaceCache.put(key, typeface);
                return typeface;
            }
        }
    }
    throw new RuntimeException("Font asset not found " + path);
}