Bit-wise or operator.
Treating both this
and other
as sufficiently large two's component integers, the result is a number with the bits set that are set in either of this
and other
If both operands are non-negative, the result is non-negative, otherwise the result is negative.
int operator |(int other);
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https://api.dart.dev/stable/2.5.0/dart-core/int/operator_bitwise_or.html