Remove old comment

Switch to atomic pointers

Fixes errors in ASAN as previously we did atomic stores to non atomic pointers

Split empty! change into seperate pr

Remove duplication in C code

Add tests

15% speed up for setindex!

Remove try catch

Signifcant performance improvement for path where error used to be caught.

Fix bug

Actually fix bug

Restore performance by not boxing key twice

Fix comment

Add comment about IdDict being mirrored in julia.h

Fix comment

Fix another comment

Allow writing NULL into iddict

Reverts the change of behaviour just in case.

Remove clutter

Added inbounds as dict.jl seems to use them as well

Unfortunately, cost is ~106 now so still too high, JuliaLang#51912 is tracking issue about high cost.

Lowers inlining cost of setproperty as we know rhs isa Memory{Any}

About 15% faster on microbenchmark, `f!(d)` example in pr comments

This reverts commit 7eb2ed6.

This reverts commit 519dfe7.

This reverts commit 7f20833.

Added inbounds as dict.jl seems to use them as well

Fixes bug if for example the call to `default` mutated the dict.

Conform to dict API, by moving `@inbounds` and changing `ht_keyindex!`.
Deal with failure case when `convert` calls fails.

TODO: think about concurrent modifications, should only be a problem in `get!`. Add tests for `convert` failing.

Caused segfaults when ht_keyindex2! caused a rehash