PostgreSQL: bad type conversion for bit type

[Tigrov]

Postgres returns bit as a string, e.g. '101'
but current type conversion makes integer 101, it's not correct.
The same problem with insert, integer is not correct for postgres bit type.

http://www.postgresql.org/docs/current/static/datatype-bit.html
http://www.postgresql.org/docs/current/static/datatype.html#DATATYPE-TABLE

I think it needs to add one more abstract type into Schema class

const TYPE_BIT = 'bit';

And then convert the type for php bindec() and for db decbin()

[Yiivgeny]

This conversion also thrown String data, length mismatch: 7 ERROR: bit string length 4 does not match type bit(8), for data zero-leading ('00001111') values on bit columns write.

[Yiivgeny]

May be using 'bit' => self::TYPE_STRING in typeMap as lightweight fix? Not ideal, but not cause error or read\write fully incorrect data?

Many (all?) GUI represent this type as 0|1 string without any conversion (what about over 64 bit digit or varbit without length?).

[Tigrov]

I made an extention to fix it
https://github.com/Tigrov/yii2-pgsql