* isolation anyway, this should not typically matter.
* Default: WANObjectCache::TTL_UNCACHEABLE.
* - pcGroup: Process cache group to use instead of the primary one. If set, this must be
- * of the format <alphanumeric name>:<max key size>. Use this for storing large values,
- * small but numerous values, or a few values with a high cost if they are evicted.
+ * of the format ALPHANUMERIC_NAME:MAX_KEY_SIZE, e.g. "mydata:10". Use this for storing
+ * large values, small yet numerous values, or some values with a high cost of eviction.
* It is generally preferable to use a class constant when setting this value.
* This has no effect unless pcTTL is used.
* Default: WANObjectCache::PC_PRIMARY.