Duplicable

This is not a mixin, since nearly all objects have this baehavior.

Is this the same as immutable? Whould that be a better name?

Methods
Public Instance methods
duplicable?()

Can you safely .dup this object? False for nil, false, true, symbols, and numbers; true otherwise.

# File lib/facets/duplicable.rb, line 10
  def duplicable?
    true
  end
to_bool()
# File lib/facets/boolean.rb, line 135
  def to_bool
    return true
  end