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Thank you for all the responses.  I think for my current purpose I’m going to go with a simple pcall wrapper.  Something like this:

local value, error = config(function() return config.UI.mainwindow.size.width end, ’number’, 100)

Or this:

local value, error = config(‘config.UI.mainwindow.size.width’, ’number’, 100)

The second would need a load() before pcall(), but makes it much easier to construct an error message.

Chris Smith <>