Added support for "sign"

Author: RGonTheNoble

Project.toml

@@ -1,7 +1,7 @@
 name = "FlexUnits"
 uuid = "76e01b6b-c995-4ce6-8559-91e72a3d4e95"
 authors = ["Ruben Gonzalez <[email protected]> and contributors"]
-version = "0.2.3"
+version = "0.2.4"
 
 [compat]
 julia = "1.10"

src/math.jl

@@ -178,8 +178,8 @@ for f in (:isfinite, :isinf, :isnan, :isreal, :isempty, :one)
     @eval Base.$f(q::AbstractQuantity) = $f(ustrip(q))
 end
 
-#Single-argument functions with dimensionless output that don't work with non-scalar units
-for f in (:iszero, :signbit, :angle)
+#Single-argument functions with dimensionless output that only work with scalar units (no offset)
+for f in (:iszero, :angle, :signbit, :sign)
     @eval Base.$f(q::AbstractQuantity) = (assert_scalar(unit(q)); $f(ustrip_base(q)))
 end