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use Params::Validate qw(validate_pos validate SCALAR ARRAYREF HASHREF)
+;
use Contextual::Return;

use Params::Validate qw( validate_pos validate );
use Contextual::Return;
...
        SCALAR   { $#{$args{fun}} }
        DEFAULT  { croak "illegal context" }
}

use Params::Validate qw( validate_pos validate SCALAR ARRAYREF HASHREF
+ );
use Contextual::Return qw();
...
        Contextual::Return::DEFAULT  { croak "listy type contexts only
+" }
    ; 
}