Fix norm of unitful quantities (#1125)

* Fix norm of unitful quantities

* add Unitful test

Author: mateuszbaran

Project.toml

@@ -1,6 +1,6 @@
 name = "StaticArrays"
 uuid = "90137ffa-7385-5640-81b9-e52037218182"
-version = "1.5.13"
+version = "1.5.14"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
@@ -17,6 +17,7 @@ BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 OffsetArrays = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 
 [targets]
-test = ["InteractiveUtils", "Test", "BenchmarkTools", "OffsetArrays"]
+test = ["InteractiveUtils", "Test", "BenchmarkTools", "OffsetArrays", "Unitful"]

src/linalg.jl

@@ -265,7 +265,7 @@ end
         $(Expr(:meta, :inline))
         l = @inbounds sqrt($expr)
 
-        0<l<Inf && return l
+        zero(l) < l && isfinite(l) && return l
         return _norm_scaled(Size(a), a)
     end
 end

test/runtests.jl

@@ -80,4 +80,5 @@ if TEST_GROUP ∈ ["", "all", "group-B"]
     addtests("flatten.jl")
     addtests("io.jl")
     addtests("svd.jl")
+    addtests("unitful.jl")
 end

test/unitful.jl

@@ -0,0 +1,6 @@
+using Unitful
+
+@testset "Unitful" begin
+    # issue #1124
+    @test norm(SVector(1.0*u"m")) == 1.0*u"m"
+end