Re: Math::BigInt new

$x overloads stringification, stringifying as "27". The new method presumably does something like:

sub new {
  my ($class, $value) = @_;
  bless { value => $value } => "$class";
}
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Thus you end up with a reference blessed into package "27".

Generally speaking, constructors are designed to be called as class methods not object methods.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'