Make isimag return false for real numbers that are zero.

Author: Sacha0

base/complex.jl

@@ -92,7 +92,8 @@ isreal(z::Complex) = iszero(imag(z))
 
 Test whether `z` is purely imaginary, i.e. has a real part equal to 0.
 """
-isimag(z::Number) = iszero(real(z))
+isimag(z::Real) = false
+isimag(z::Complex) = iszero(real(z))
 isinteger(z::Complex) = isreal(z) & isinteger(real(z))
 isfinite(z::Complex) = isfinite(real(z)) & isfinite(imag(z))
 isnan(z::Complex) = isnan(real(z)) | isnan(imag(z))

test/complex.jl

@@ -969,3 +969,6 @@ end
 
 # issue #19240
 @test big(1)/(10+10im) ≈ (5-5im)/big(100) ≈ big"0.05" - big"0.05"*im
+
+# Test that isimag yields false for real numbers that are zero
+@test !isimag(0)