Warning: this is an internal module, and does not have a stable API or name. Functions in this module may not check or enforce preconditions expected by public modules. Use at your own risk!
A module containing unsafe operations, for very very careful use in heavily tested code.
This function is identical to the normal unsafeInterleaveST, but is inlined and hence faster.
Note: This operation is highly unsafe, as it can introduce
externally visible non-determinism into an