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Iteration bug #84

Description

@molaxx

Hi,
I've stumbled upon a bug where I can't access all the entries in the immutables.Map via iteration.
The following bash script should reproduce it.
I tested it on:
Python 3.9.5 (default, Nov 23 2021, 15:27:38)
[GCC 9.3.0]

Python 3.9.9 (main, Nov 21 2021, 03:23:42)
[Clang 13.0.0 (clang-1300.0.29.3)]

PYTHONHASHSEED=0 python <<EOF
import itertools
import immutables
import random
seed=b'b\xe6\xe2\x82\xe5\xc1e|'
r = random.Random(seed)
a = immutables.Map(
    zip(
        (r.randrange(0, 10000000000) for i in range(820000)),
        itertools.repeat(None, 820000),
    )
)

len1 = len(a)
len2 = len(tuple(a))
if len1 != len2:
    print(f"BADDDD seed:{seed} len(a)={len1} len(tuple(a))={len2}")
    
    
EOF

I'll be happy to get help debugging this.

Thanks you
Eli

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