Commits on May 5, 2023

1. Define a method for hash(::Type, ::UInt) …

   Currently, `hash(::Type, ::UInt)` uses `objectid`, which can have some
   odd behavior for types: in particular, subsequent identical type-valued
   variable definitions can have `objectid`s which differ from the first
   such definition. This has some bizarre downstream effects when e.g.
   using types as the values of a `Set` or the keys of a `Dict`. See issue
   49620 for examples.
   
   There is an internal `type_hash` C function used for caching types but
   isn't exposed to Julia, as Jameson pointed out in the linked issue. This
   commit exposes it as `jl_type_hash` which is then used via `ccall` to
   define a method `hash(::Type, ::UInt)`. This method then fixes #49620.
   Note, however, that this does not affect the differing `objectid`s for
   otherwise identical types.

   

   ararslan committed May 5, 2023
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