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getLongLongFromObject calls string2ll which has this line: /* Return if not all bytes were used. */ so if you pass an sds with 3 characters "1\01" it will fail. but getLongDoubleFromObject calls strtold, and considers it ok if eptr[0]==`\0` i.e. if the end of the string found by strtold ends with null terminator 127.0.0.1:6379> set a 1 OK 127.0.0.1:6379> setrange a 2 2 (integer) 3 127.0.0.1:6379> get a "1\x002" 127.0.0.1:6379> incrbyfloat a 2 "3" 127.0.0.1:6379> get a "3"