Cloning values fetched from variables in order to set their paths and line-numbers to the point of reference. (Using the original values would result in paths and line-numbers being reported as the point of assignment, which is not helpful for debugging.)

Passing the path and line-number into the built-in functions in order to generate the most accurate file-names and line numbers for intermediate return values.

Using the file-name and line-number of the function name as the file-name and line-number of a function call.

Cloning the color nodes that are fetched from the name-to-color conversion table, so that we can put in the right filename and line number.

Implemented adjust-color -- what was once the most troublesome is now relatively simple thanks to the improved built-in argument specification and binding mechanism!

Trying out new scheme built-in function definitions. Allows built-ins to have default args and whatnot, and to be specified more easily than before.