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  1. or download this
    sub foobar($);

foobar(($)@arr);
  2. or download this
    use warnings '+mixedtypes';
@a=(1,2);
@b=(@a, [3,4]);   #would give warning!
  3. or download this
    use warnings '+mixedtypes';
@a=(1,2);
$a[1]=[3,4];     #warning - mixed type assigned to @a
$a[1]=($)[3,4];  #would store the ref into a scalar-typed target witho
+ut warning