NAME

 Collection::CrcColl - experimental class for collections 

TYPES

varchar => string strin binary => hex2raw ( raw2hex) BINARY refhash => { var1=>'1', var2=>0} string ('var1=0 , var=2')

_expand_rules

Owerwrite method and add check _crc fields

_prepare_where <query hash>

return <where> expression or undef else