"I have adjusted these methods to perform up to 100 operations concurrently against the cache, and where there are more than 100 operations to do, it performs the first 100, then the next 100, etc. This also fixes a bug where it is attempted to iterate the keys more than once. An iterable in PHP need not implement the ability to rewind, so we must only iterate once."
This PR continues #162:
"I have adjusted these methods to perform up to 100 operations concurrently against the cache, and where there are more than 100 operations to do, it performs the first 100, then the next 100, etc. This also fixes a bug where it is attempted to iterate the keys more than once. An iterable in PHP need not implement the ability to rewind, so we must only iterate once."