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msgpack.loads hangs for a long time on invalid input #97

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@knsd

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@knsd

Minimal reproducible example:

from msgpack import loads
#      ---------------------- Array 32
#     |           ----------- Large number
#     |          |        --- No other data
#     |          |       |
#     v          v       v
s = "\xdd\xff\x00\x00\x00"
loads(s)

Function loads in this example consumes a lot of memory and will have failed years later.
And looks like str 32 and map 32 are not affected.

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