bson/src/main/org/bson/BasicBSONObject.java
@SuppressWarnings("unchecked")
    private static Object canonicalize(final Object from) {
        if (from instanceof BSONObject && !(from instanceof BasicBSONList)) {
            return canonicalizeBSONObject((BSONObject) from);
        } else if (from instanceof List) {
            return canonicalizeList((List<Object>) from);
        } else if (from instanceof Map) {
            return canonicalizeMap((Map<String, Object>) from);
        } else {
            return from;
        }
    }
@SuppressWarnings("unchecked")
    private static Object canonicalize(final Object from) {
        if (from instanceof BSONObject && !(from instanceof BasicBSONList)) {
            return canonicalizeBSONObject((BSONObject) from);
        } else if (from instanceof List) {
            return canonicalizeList((List<Object>) from);
        } else if (from instanceof Map) {
            return canonicalizeMap((Map<String, Object>) from);
        } else {
            return from;
        }
    }
@ SuppressWarnings ( "unchecked" ) private static Object canonicalize ( final Object from ) { if ( from instanceof BSONObject && ! ( from instanceof BasicBSONList ) ) { return canonicalizeBSONObject ( ( BSONObject ) from ) ; } else if ( from instanceof List ) { return canonicalizeList ( ( List < Object > ) from ) ; } else if ( from instanceof Map ) { return canonicalizeMap ( ( Map < String , Object > ) from ) ; } else { return from ; } }
create a copy of "from", but with keys ordered alphabetically
create a copy of from but with keys ordered alphabetically