I would like to know if it is possible to alter a variable during the
process of a custom validation. I know that it is no longer validation
when your altering data but in my opinion there are times when you
need alter it for simplicity sakes. A good example would be for a
world wide auction house type application and to to convert currency
to one single format, when you validate you check to see if both the
amount is alright along with the currency type. (This is assuming you
can type in what type of currency it is, and for this example is
possible.)

The application I am developing allows the user to type in multiple
currencies at one (This is a D20 RPG, and people type in something
along the line of 12 pp 145 gp 78 sp 21 cp) and so far the validation
process involves converting it all to the lowest currency type. But
for the sake of being DRY I would only need to add another line to set
the variable, but instead it is looking like I would have to repeat
the whole method and add in the single line and change it that way on
creation and updates.

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