UTF-8 encoded string in Task throwing exception

[roback]

If the arg string given to Task.new is encoded as UTF-8 and contains chars such as åäö, an
Encoding::CompatibilityError Incompatible character encodings: UTF-8 and ASCII-8BIT is thrown on line 217.

Calling .force_encoding(Encoding::ASCII_8BIT) on the arg string before calling Task.new("test", arg) fixes the problem.

[tamoyal]

+1

[johnewart]

I'll write some specs to test this and then fix it.