Period in map key name breaks when unmarshalling to struct

[dustin-decker]

I'm unmarshalling yaml to a struct.
I've encountered issues unmarshalling if a map's key containers period character.

Struct that I unmarshall to:

type Config struct {
	ListenInterface string
	ListenPort      int
	Thing           map[string]SomeOtherThing
}

type SomeOtherThing struct {
	Stuff string
}

YAML:

ListenInterface: 127.0.0.1
ListenPort: 8080
Thing:
  .broken:
    Stuff: missing
  partially.works:
    Stuff: missing
  fully-works:
    Stuff: works

Output looks like:

(main.Config) {
 ListenInterface: (string) (len=9) "127.0.0.1",
 ListenPort: (int) 8080,
 Thing: (map[string]main.SomeOtherThing) (len=3) {
  (string) "": (main.SomeOtherThing) {
   Stuff: (string) ""
  },
  (string) (len=9) "partially": (main.SomeOtherThing) {
   Stuff: (string) ""
  },
  (string) (len=11) "fully-works": (main.SomeOtherThing) {
   Stuff: (string) (len=5) "works"
  }
 }
}

I put a demo here:
https://github.com/sevoma/testViper

[dustin-decker]

I added a go-yaml output example (which works correctly), but only after lower-casing the YAML keys. The Viper output remains the same after lower-casing the YAML keys.

[johnabass]

This also happens with JSON maps as well, e.g.

{ "events": {"foo.bar": "moo"}}

When unmarshalled to a struct, the error ...source data must be an array or slice, got map is returned.

[dustin-decker]

dupe of #324