function getConflicts(object, key) {
  if (object[CONFLICTS] && object[CONFLICTS][key] &&
      Object.keys(object[CONFLICTS][key]).length > 1) {
    return object[CONFLICTS][key]
  }
}
Fetches the conflicts on the property `key` of `object`, which may be any
object in a document. If `object` is a list, then `key` must be a list
index; if `object` is a map, then `key` must be a property name.