Use a string for whether a key is tunable
Use a string for whether a key is tunable

Kitware/sprokit,linus-sherrill/sprokit,mathstuf/sprokit,linus-sherrill/sprokit,linus-sherrill/sprokit,mathstuf/sprokit,linus-sherrill/sprokit,Kitware/sprokit,Kitware/sprokit,Kitware/sprokit,mathstuf/sprokit,mathstuf/sprokit