Negating Gains

[anojo]

Is it intentional that this works (-2u"dB"), and this works (0u"dB" - 2u"dB") but not this (-(2u"dB")) nor (-uconvertp(u"dB", 2)) nor this (-uconvertrp(u"dB", 2))?

[sostock]

It’s probably not intentional. If addition is well-defined, negation should work as well.

[anojo]

Maybe it just needs an extra line like -(x<:Gain) = inv(x) ?

[anojo]

Also, multiplying a Gain by a number works but dividing doesnt.

[anojo]

This is less related but, ustrip(dB, 2dB) doesnt work, while ustrip(uconvert(dB, 2dB)) does. Maybe the former should return the same as the latter?

[anojo]

Also, maybe the definition for converting to types of floats for quantities ((Base.$f)(x::AbstractQuantity) = Quantity($f(x.val), unit(x)) in quantities.jl lines 436-445) should extend to log units too. Right now, one can't do e.g. Float16(2dB)