message: fix(es/minifier): Don't create keys with negative number
diff: @@ -71,8 +71,10 @@ impl Pure<'_> {
  }
  }
  Expr::Lit(Lit::Num(n)) => {
  + if n.value.is_sign_positive() {
  *p = PropName::Num(n.clone());
  }
  + }
  _ => {}
  }
  }
  