With this change, `Uuid::uuid1()`, `Uuid::uuid2()` and so forth now produce a `LazyUuidFromString` instance, which
is both more memory efficient and comparable to `Uuid::fromString()` instances in other tools, such as within
PHPUnit's `Assertion::assertEqual()`, which would reject any two objects not matching each other's types.
Before this patch, `Assertion::assertEquals(Uuid::uuid5(...), Uuid::fromString(...))` would always fail due to
different subtypes produced by the two factory methods.
As documented in https://wiki.php.net/rfc/use_global_elements, the engine (by default) does a local namespace
lookup, then falls back to global namespace when first calling a global function referenced in namespaced code,
unless that function is referenced via fully qualified name (FQN).
By using the FQN, the actual symbol can be looked up at compile-time, both by the PHP engine and by static analysis
tooling, allowing for compiler (in particular) optimizations to replace known hot-path functions with specialized opcodes.
Sadly, no actual benchmark at hand: the improvements can be minimal or massive, depending on where this library is
used (tight loops being most relevant).
Ben Ramsey
Marco Pivetta
Ben Ramsey
Julian Ecknig
Jildert Miedema
Ben Peachey
Andreas Möller