Rails validation :if => Proc.new or lambda?

Question

I have found that in all examples (include rails documentation) that I have seen for the :if option of validation methods uses Proc.new instead of lambda, for example

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Answer 1

Both seems to be desirable behavior for :if option mentioned above, is there anything I am missing?

I'm guessing that:

It's more desirable to allow Procs as they don't care about the number of arguments. So I could easily write any of the below:

validates_presence_of :name, :if => Proc.new{|f| f.display_name.blank? }    # I care about 'f' here as I need it to check something.

... and:

validates_presence_of :secret_sauce, :if => Proc.new{ MyApp::REQUIRE_SECRET_SAUCE }    # I don't care about any arguments being passed in.

This may seem like a minor thing, but I guess it adds to the flexibility.