Fractional scaling, by definition, will make stuff blurry. Clean bitmap graphics and fractional scaling are incompatible requirements.
Proof: consider a pattern of alternating black and white pixels: 0, 255, 0, 255, 0, 255, etc. This pattern cannot be scaled to a non-integer factor without introducing gray colors (i.e., by blurring-out the pattern). If your app produces this pattern, then fractional scaling will blur your app.
Proof: consider a pattern of alternating black and white pixels: 0, 255, 0, 255, 0, 255, etc. This pattern cannot be scaled to a non-integer factor without introducing gray colors (i.e., by blurring-out the pattern). If your app produces this pattern, then fractional scaling will blur your app.