TotallyNotJson.roc now lives on the farm in virtual-dom-wip as Json.roc.
Any reference in stdlib or builtins has been removed, as well as the
last places it was used (in python/ruby-interop examples).
We will now show a warning if a builtin is imported explicitly,
since this is unncessary.
We will not show the warning if they expose functions from the builtin:
import Dict exposing [isEmpty]
However, we will show a special warning if they expose types from it:
import Dict exposing [Dict, isEmpty]
We were still passing `ModuleIds` from `load` to `can`, but now
that imports can appear in any scope, we don't know which package
an unqualified module name belongs to from the top level.
We now pass `PackageModuleIds` instead and keep a Map of `ModuleName` to
`ModuleId` in `Scope`.
This also allow us to import multiple modules with the same name from different
packages as long as a unique alias is provided.
The usize one gets used internally for things like
pattern matches. This is both more efficient (means
they don't have to do unnecessary casts) and also
less error-prone due to e.g. comparing length to
capacity, which is usize.
ankerl::dense_unordered is a very fast hash map that is built to be an index map.
This enables extra optimizations compared to just wrapping a regular hash map.
As such, I think this map is very well suited for our index map impl in Roc.
I also think this dictionary implementation is simpler overall.
On top of that, this removes the need for SIMD instructions for peak performance.
Benchmarks of the C++ version and other C++ hash maps are here: https://martin.ankerl.com/2022/08/27/hashmap-bench-01/
Though this has clear bias of being written by the author of ankerl::dense_unordered,
the results all look correct and the benchmarks thorough.
