this is a partial fix for #2717, but still not ideal because it'll spam whenever a chunk is attempted to be generated. However, fixing this properly requires potentially breaking API changes.
This is better for performance because these then don't need to be reevaluated every time they are called.
When encountering an unqualified function or constant reference, PHP will first try to locate a symbol in the current namespace by that name, and then fall back to the global namespace.
This short-circuits the check, which has substantial performance effects in some cases - in particular, ord(), chr() and strlen() show ~1500x faster calls when they are fully qualified.
However, this doesn't mean that PM is getting a massive amount faster. In real world terms, this translates to about 10-15% performance improvement.
But before anyone gets excited, you should know that the CodeOptimizer in the PreProcessor repo has been applying fully-qualified symbol optimizations to Jenkins builds for years, which is one of the reasons why Jenkins builds have better performance than home-built or source installations.
We're choosing to do this for the sake of future SafePHP integration and also to be able to get rid of the buggy CodeOptimizer, so that phar and source are more consistent.
This was the cause of many inconsistency and broken world bugs. In the future (once we switch to paletted chunks) this won't be possible anyway. For now, some temporary API is provided to allow modifying chunkdata directly, but it is required that **both** must be provided.
it's the generator's responsibility to know about the seed, not the chunkmanager's. This now reduces the complexity of implementing and using a chunkmanager.
