hy;hen/underscore equivalence in signal names?

["Boncek, John" <jboncek Hunter COM>]

I typed an underscore instead of a hyphen by mistake in a GtkEntry signal
name, "insert_text" instead of "insert-text", at one of 2 places the name
was used.  It worked.  I inverted both of them and it still worked.
Apparently these are interchangeable, at least in this one instance, in
GTK 2.2.4.