Union of string and bytes should be bytes

[acmiyaguchi]

jsonschema-transpiler/src/ast.rs

Lines 137 to 145 in 536c6fd

	(Type::Atom(left), Type::Atom(right)) => {
	let atom = match (left, right) {
	(Atom::Boolean, Atom::Boolean) => Atom::Boolean,
	(Atom::Integer, Atom::Integer) => Atom::Integer,
	(Atom::Number, Atom::Number)
	| (Atom::Integer, Atom::Number)
	| (Atom::Number, Atom::Integer) => Atom::Number,
	(Atom::String, Atom::String) => Atom::String,
	(lhs, rhs) => {

The union of a string and bytes should probably be bytes, for now it'll be dropped or casted into a string.

{"oneOf": [{"type": "string"}, {"type": "string", "format": "bytes"}]}

Originally posted by @acmiyaguchi in #82 (comment)