Interpolated style objects don't convert unitless number values to 'px'

## Version
1.0.5

## Reproduction

https://codesandbox.io/s/kJGX2Qkr

## Steps to reproduce

Interpolate an object with a unitless value as shown above

## Expected Behavior

Unitless values would interpolate to add 'px'

## Actual Behavior
Unitless values are interpolated directly