Fix norm of unitful zero vector (#1128)

* Fix norm of unitful zero vector

* bump version

Author: mateuszbaran

Project.toml

@@ -1,6 +1,6 @@
 name = "StaticArrays"
 uuid = "90137ffa-7385-5640-81b9-e52037218182"
-version = "1.5.14"
+version = "1.5.15"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

src/linalg.jl

@@ -247,7 +247,7 @@ end
         $(Expr(:meta, :inline))
         scale = maxabs_nested(a)
 
-        scale==0 && return _init_zero(a)
+        iszero(scale) && return _init_zero(a)
         return @inbounds scale * sqrt($expr)
     end
 end

test/unitful.jl

@@ -3,4 +3,6 @@ using Unitful
 @testset "Unitful" begin
     # issue #1124
     @test norm(SVector(1.0*u"m")) == 1.0*u"m"
+    # issue $1127
+    @test norm(SVector(0.0, 0.0)*u"nm") == 0.0*u"nm"
 end