from INT64 arithmetic in MATLAB by Petter
Enables int64 Addition, subtraction, multiplication, division and modulus.

mtimes(a,b)
function c = mtimes(a,b)

	if numel(a)>1 && numel(b)>1
		%error('Only elementwise multiplication supported.');
		c = int64matmul(int64(a),int64(b));
	else
		checkinputs(a,b);
		c = int64times(int64(a),int64(b));
	end
	
end

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