зеркало из https://github.com/github/ruby.git
f0d08d11dc
st_copy allocates a st_table, which is not needed for hashes since it is
allocated by VWA and embedded, so this causes a memory leak.
The following script demonstrates the issue:
```ruby
20.times do
100_000.times do
{a: 1, b: 2, c: 3, d: 4, e: 5, f: 6, g: 7, h: 8, i: 9}
end
puts `ps -o rss= -p #{$$}`
end
```
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