Vista - What is the default scope value?

I have this function - which works.

function mine {get-variable -scope global|do-stuff}

But now, I sometimes need to process all the variables.

function mine ($scope = 'global'){{get-variable -scope $scope|do-
stuff}

What value can I pass that will cause get-variable to return the same
list I get when omitting -scope?

You pseudo example is hurting my head. Can you post an example we could try?

Of if you are asking about the default value for the -scope parameter of Get-Variable, it is LOCAL.