-- value.cue --
m: _ @protobuf(1,map[string]string)
m: foo: "bar"
m: qux: "quux"
m: "1": "one"

// Doc 1
intMap: _ @protobuf(1,map[int]string)
// Doc 2
intMap: {"1": "one"}
// Doc 3 (seems not to be supported by proto)
intMap: "2": "two"
intMap: {
	// Doc inner (seems not to be supported by proto)
	"3": "three"
}
-- out/encode --
m: {
  key: "foo"
  value: "bar"
}
m: {
  key: "qux"
  value: "quux"
}
m: {
  key: "1"
  value: "one"
}
# Doc 1
# Doc 2
intMap: {
  key: 1
  value: "one"
}
intMap: {
  key: 2
  value: "two"
}
intMap: {
  key: 3
  value: "three"
}