Comment 4 for bug 1883770

This crazy patch makes the test pass on s390x in groovy:
--- a/decode.go
+++ b/decode.go
@@ -500,7 +500,8 @@
     return true
    }
   case float64:
- if resolved <= math.MaxInt64 && !out.OverflowInt(int64(resolved)) {
+ is_overflow := out.OverflowInt(int64(resolved))
+ if resolved <= math.MaxInt64 && !is_overflow {
     out.SetInt(int64(resolved))
     return true
    }