[pull] master from ruby:master #422
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The following script leaks memory:
10.times do
100_000.times do
"\ufffd".encode(Encoding::US_ASCII, fallback: proc { Object.new })
rescue
end
puts `ps -o rss= -p #{$$}`
end
Before:
450244
887748
1325124
1762756
2200260
2637508
3075012
3512516
3950020
4387524
After:
12236
12364
12748
13004
13388
13516
13772
13772
13772
13772
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