Update src/fixed.jl

Co-Authored-By: kimikage <[email protected]>

Author: timholy

src/fixed.jl

@@ -167,7 +167,7 @@ Base.unitrange_last(start::F, stop::F) where {F<:Fixed} =
 
 # Range lengths
 Base.unsafe_length(r::AbstractUnitRange{F}) where {F <: Fixed{<:Union{SShorterThanInt,Int},f}} where {f} =
-    Int(reinterpret(last(r)) >> f - reinterpret(first(r)) >> f) + 1
+    ((Int(reinterpret(last(r))) - Int(reinterpret(first(r)))) >> f) + 1
 Base.unsafe_length(r::AbstractUnitRange{F}) where {F <: Fixed{T,f}} where {T<:Signed,f} =
     T(reinterpret(last(r)) >> f - reinterpret(first(r)) >> f) + oneunit(T)
 Base.length(r::AbstractUnitRange{F}) where {F <: Fixed{<:SShorterThanInt,f}} where {f} =