Returns the whitespace preceding the expression
Sets the whitespace preceding the expression
Get argument value from argument map given arg name
Name of argument to get
Initialize optional argument map. Optional argument should have default values
Set the argument's value
Name of argument to set values
Value to set
Update argument's value and mark as modified
Name of argument to update
Program's current context
The value to give to the argument
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Argument map for functions. Begins with positional args first, then follows with optional named args. Positionals don't have default value and must be supplied, while optional named args MUST have default values. Note: Map traversal is in order of insertion.