Incorrect PHP Version Error?

When running on a test host with PHP 5.2.9 I see the following error: “Braintree Error: Braintree requires PHP 5.2.1 and above. You are using version 5.2.9.”

Could it be a problem with the version check? The “phpversion” article on php.net has some ideas for emulating the PHP_VERSION_ID for simple comparisons: https://php.net/manual/en/function.phpversion.php

EDIT: Working through the source I see that 5.3+ is expected. Just out of curiosity, what portion(s) requires 5.3?
FWIW, I also recommend putting that minimum version string into a class constant and using “PHP_VERSION” instead of “phpversion()”.