Can't `convert(Float64, unitful_float64)`?

[asinghvi17]

MWE:

julia> using Unitful
julia> convert(Float64, 1.0u"m")
ERROR: DimensionError:  and m are not dimensionally compatible.
Stacktrace:
 [1] #s103#141
   @ ~/.julia/packages/Unitful/GYzMo/src/conversion.jl:7 [inlined]
 [2] var"#s103#141"(::Any, s::Any, t::Any)
   @ Unitful ./none:0
 [3] (::Core.GeneratedFunctionStub)(::UInt64, ::LineNumberNode, ::Any, ::Vararg{Any})
   @ Core ./boot.jl:602
 [4] uconvert(a::Unitful.FreeUnits{(), NoDims, nothing}, x::Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}})
   @ Unitful ~/.julia/packages/Unitful/GYzMo/src/conversion.jl:72
 [5] convert(::Type{Float64}, y::Quantity{Float64, 𝐋, Unitful.FreeUnits{(m,), 𝐋, nothing}})
   @ Unitful ~/.julia/packages/Unitful/GYzMo/src/conversion.jl:139
 [6] top-level scope
   @ REPL[274]:1

Looking into the code, it seems there is a special case to handle this. Did it bitrot at some point?

[rafaqz]

convert is called automatically in many places, it would break the safety of putting units on values if they could be automatically stripped anywhere!

[brainandforce]

If you need to get the scalar value associated with a quantity, use ustrip(u::Units, x::Quantity), which converts x to the units u and then returns the scalar portion.

As @rafaqz mentioned above, ustrip(::Quantity) or other methods of generating a scalar are unsafe: 100u"m", 100u"km", and 100u"s" are all stripped to 100 even though they have totally different meanings.