Same changes for U+025B/U+03B5

src/pkgdefaults.jl

@@ -394,8 +394,8 @@ const μ0 = 4π*(1//10)^7*H/m         # exact (but gets promoted to Float64...),
 \nA quantity representing the vacuum permittivity constant, defined as 1 / (μ0 × c^2).
 \nDimension: 𝐈^2 𝐓^4 𝐋^-3 𝐌^-1.
 \nSee also: [`Unitful.μ0`](@ref), [`Unitful.c`](@ref)."
-const ɛ0 = 1/(μ0*c^2)               # exact, electric constant; changes here may affect
-@doc @doc(ɛ0) const ϵ0 = ɛ0                           # test of issue 79.
+const ε0 = 1/(μ0*c^2)               # exact, electric constant; changes here may affect
+@doc @doc(ε0) const ϵ0 = ε0         # test of issue 79.
 "    Unitful.Z0
 \nA quantity representing the impedance of free space, a constant defined as μ0 × c.
 \nDimension: 𝐋^2 𝐌 𝐈^-2 𝐓^-3.

test/runtests.jl

@@ -188,7 +188,7 @@ end
             @test uconvert(g, 1*FixedUnits(kg)) == 1000g         # manual conversion okay
             @test (1kg, 2g, 3mg, missing) .|> g === (1000g, 2g, (3//1000)g, missing)
             # Issue 79:
-            @test isapprox(upreferred(Unitful.ɛ0), 8.85e-12u"F/m", atol=0.01e-12u"F/m")
+            @test isapprox(upreferred(Unitful.ε0), 8.85e-12u"F/m", atol=0.01e-12u"F/m")
             # Issue 261:
             @test 1u"rps" == 360°/s
             @test 1u"rps" == 2π/s
@@ -1861,6 +1861,11 @@ end
     @test uparse("µm") === uparse("μm")
     @test uparse("dBµV") === uparse("dBμV")
     @test @doc(Unitful.µm) == @doc(Unitful.μm)
+    # Julia treats ɛ (U+025B) and ε (U+03B5) as the same
+    @test Unitful.ɛ0 === Unitful.ε0
+    @test u"ɛ0" === u"ε0"
+    @test uparse("ɛ0") === uparse("ε0")
+    @test @doc(Unitful.ɛ0) == @doc(Unitful.ε0)
 end
 
 module DocUnits