Cannot "Watch" variables that contain spaces in the name. (4276058)

When attempting to add a watch that contains a space in the Procedure Editor, for example "First Name", the watch window states:

Value
undeclared identifier '"First Name"'.

Oracle issue regarding spaces in variable names.
Since Toad is dependent on the Oracle DBMS_DEBUG API, we are limited by Oracle's own limitations. This is also an issue in SQL Developer.

WORKAROUND:
The spaces in variable names should ideally be underscores or another character separator, to eliminate the spaces.

A workaround is assigning a normal variable the value of the variable with spaces in the code for debugging and do a watch on the normal variable.

X := "variable with spaces";