- * Deflate (zlib): `"deflate"`
- * `...` indicates method-specific arguments. Currently defined arguments are:
- * Deflate: `level` - Compression level, `0`-`9` or `nil`.
+ * Deflate (zlib): `"deflate"`
+ * Zstandard: `"zstd"`
+ * `...` indicates method-specific arguments. Currently defined arguments
+ are:
+ * Deflate: `level` - Compression level, `0`-`9` or `nil`.
+ * Zstandard: `level` - Compression level. Integer or `nil`. Default `3`.
+ Note any supported Zstandard compression level could be used here,
+ but these are subject to change between Zstandard versions.