value() function for Unitful quantity without uncertainty

[Tom Van Acker]

Hi @giordano,

Currently, the following results in an error: Measurements.value(2.0u"hr"), as the type is restricted to AbstractQuantity{<:Measurement}. Changing the latter to simply AbstractQuantity fixes this, however I'm uncertain whether this would break other features.

Changing this would be extremely helpful when working with both certain and uncertain variables.

with kind regards,

Tom

[Tom Van Acker]

@giordano thanks for the quick response! big fan of the package!