bug report

[578223592]

当我浏览 https://redis.io/commands/bitpos/，
我发现：

我认为输出应该是8，于是在网页端redis验证了一下，结果如下：

完整的网页输出：

redis> SET mykey "\xff\xf0\x00"
"OK"
redis> BITPOS mykey 0
(integer) 0
redis> SET mykey "\x00\xff\xf0"
"OK"
redis> BITPOS mykey 1 0
(integer) 1
redis> BITPOS mykey 1 2
(integer) 18
redis> BITPOS mykey 1 2 -1 BYTE
(integer) 18
redis> BITPOS mykey 1 7 15 BIT
(integer) 9
redis> set mykey "\x00\x00\x00"
"OK"
redis> BITPOS mykey 1
(integer) 1
redis> BITPOS mykey 1 7 -3 BIT
(integer) 9
redis> get mykey
"\x00\x00\x00"