Location information when parsing numbers
Removing the earlier TODO, now a bug
TODO for better type support in interpreter
Document gocheck usage to avoid confusion
Location support for errors with string parsing
Location support for errors with boolean parsing
Location support for errors with symbol parsing

Tests pass
Location support for errors with integer parsing

Tests pass
Location support for errors with float parsing

Tests pass
Location support for errors with complex parsing

Tests pass
Use embedded types for more concise code
Location support for errors with rational parsing

Tests pass
Location support for errors with character parsing

Tests pass