Yes, I'm also a fan of Perl allowing underscores in numeric literals.

BTW, I was pleasantly surprised to learn that the C++ committee are also fans of this splendid idea:

• C++11 user-defined literals: These are extensible and use a trailing underscore. For example: 12_km
• C++14 digit separators: "The single-quote character ' can now be used anywhere within a numeric literal for aesthetic readability". For example: 500'000 or 500'000_km or pi = 3.14159'26535'89793. Presumably, single quote was chosen for the digit separator because underscore had already been taken by user-defined literals.