printSchema already sorts the type names alphabetically:

It would also be useful for diffing if fields, arguments, enum values and various other entities were also sorted alphabetically. I have performed some local modifications and it seems the changes required are quite minor. However, I believe it's possibly the case that a schema sorted in one way is not identical to a schema sorted in another because the order of fields/arguments may affect the order in which they are resolved?

I therefore have the following questions:

1. Would ordering the printSchema alphabetically by default be an acceptable change?
2. If not, would it be acceptable to add a second argument added to printSchema that supports an enumeration of sort modes (e.g. 'natural' for the current ordering, 'alphabetic', and even something more exotic like ordering by heirarchy as in Add printFineSchema() for printing hierarchy ordered types. #281)?
3. Would you accept a pull request to add these changes?

Keywords (to help others find this issue, also detailing what I searched for before): alphabetic, lexographic, lexical, order, sort, printSchema, print, stable