hashset regression

[dom96]

It appears that #13418 has regressed the HashSet implementation.

The repro isn't straightforward but this actually leads to a leak from what I can tell. Lucky for me I spent the whole day tracking it down in my game :/

Here is the repro: https://gist.github.com/dom96/f84dd692f42a35c30bbee14309529d9e

In order to compile it you'll need to export data in HashSet type.

For devel:

$ nim c -r repro.nim
1024
7

For 1.0.6:

$ nim c -r repro.nim
64
7

During the runtime of my game the set's size keeps growing, which makes iterating over it slower and slower.

[narimiran]

cc @timotheecour @c-blake

[timotheecour]

@dom96 thanks for bug+repro, can you please check if #13800 fixes your issue?
It should work but if not, I'll investigate further.