MMatrix generation with @MMatrix requires equal type for elements

[judober]

I ran into this:

@MMatrix [1 1; 1 1.0]

errors with Size mismatch in Static Array parameters. Got size Tuple{2, 2}, dimension 2 and length 1.
The same works for SMatrix:

@SMatrix [1 1; 1 1.0]

turning all elements into float64. The workaround is this:

@MMatrix [1.0 1.0; 1.0 1.0]

I would expect MMatrix to behave like SMatrix.
Also, for MVector it works:

@MVector [1, 1.0]