It would be good to see example. but generally you should use BUILD and BUILDARGS instead of modifying new. Also declare BUILDARGS as follows: 

method BUILDARGS (ClassName $class: ...) {
   ...
}

[download]
so it wouldn't complain about failed validation.

In reply to Re: MooseX::Declare not able to modify new() and BUILDARGS() by zwon
in thread MooseX::Declare not able to modify new() and BUILDARGS() by llancet

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