I have a puzzle for a long time that why a negative int32 must be
encoded into 10 bytes instead of 5, 5 bytes of encoded var int has
enough bits(5*7=35) to represent a 32 bit value, and packet decoder
know it's a int32 so it extract 32 bits outof 5 bytes to restore the
int32 precisely, even if it's negtive.So why must protobuf encode
negative int32 to 10 bytes? Thank you.

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