Support arrays

spec/config-spec.coffee

@@ -602,3 +602,15 @@ describe "Config", ->
           nestedObject:
             nestedBool: true
 
+    describe 'when the value has an "array" type', ->
+      beforeEach ->
+        schema =
+          type: 'array'
+          default: [1, 2, 3]
+          items:
+            type: 'integer'
+        atom.config.setSchema('foo.bar', schema)
+
+      it 'converts an array of strings to an array of ints', ->
+        atom.config.set 'foo.bar', ['2', '3', '4']
+        expect(atom.config.get('foo.bar')).toEqual  [2, 3, 4]

src/config.coffee

@@ -427,8 +427,18 @@ Config.addTypeFilters
       value
 
   'object':
-    typeCheck: (value, schema) ->
+    coercion: (value, schema) ->
+      throw new Error() if typeof value isnt 'object'
       return value unless schema.properties?
       for prop, childSchema of schema.properties
         value[prop] = @executeTypeFilters(value[prop], childSchema) if prop of value
       value
+
+  'array':
+    coercion: (value, schema) ->
+      throw new Error() unless Array.isArray(value)
+      itemSchema = schema.items
+      if itemSchema?
+        @executeTypeFilters(item, itemSchema) for item in value
+      else
+        value