parse error on class parameters named default

It seems that under 2.7.x (or at least 2.7.25) it is valid to define a class in the DSL with a parameter named default but it is invalid to declare a class with a parameter of the same name. Eg.

$ be puppet --version
2.7.25
$ be puppet apply -e 'class foo($default = "foo") { notify{$default:} } class

'
notice: foo
notice: /Stage[main]/Foo/Notify[foo]/message: defined 'message' as 'foo'
notice: Finished catalog run in 0.04 seconds
$ be puppet apply -e 'class foo($default = "foo") { notify{$default:} } class

'
Could not parse for environment production: Syntax error at 'default'; expected '}' at line 1 on node leo.tuc.noao.edu

Note that be == bundle exec