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I'd like Fat to return a default value on failed lookups - basically emulating plain Hash#fetch usage.

Example:

Fat.at({}, :one, :two, :three, default: 'caramba!') #=> 'caramba!'

Currently, Fat does not support simple lookups.

I would like to use Fat in a project where I don't know if keys are more than 1 level deep.

I don't know if this would be the best syntax for it Fat.at(hash, "foo:") or Fat.at(hash, "foo.")

What do you think?

This is the test case against this feature:

test "single argument must be a namespace" do
    assert_raise(Fat::FatError) { Fat.at({"foo" => "bar"}, "foo") }
end

See https://github.com/tonchis/fat/blob/master/benchmarks/fat.rb#L101-L118