Make static code analysis more correct (which does not also mean less noisy) by replacing "dict" and "dictionary" types in PhpDoc with what they actually are: an array.
The "dictionary" type is not mentioned in arcanist/src/parser/PhutilTypeSpec.php either, thus no side effects.

See also related discussions in https://we.phorge.it/D26037 and https://we.phorge.it/D26039#27821

Grep and read the code, use static code analysis.