nice! one annoying nit pick for me though is using commas as data separators. when you need to input data by hand into a multi dim array this can get annoying very quickly
It's true; I think this syntax was probably made more for reading than writing since the main place it appears in the base language is just `Meta.show_sexpr`, but it's still interesting to play around with, and parsing it has some fun properties like that you can use Julia's standard syntax as effectively a preprocessor syntax for the s-expression syntax.