Properly format -0.0

Author: jmkuhn

src/fmtcore.jl

@@ -63,7 +63,7 @@ _digitchar(x::Integer, ::_Oct) = Char('0' + x)
 _digitchar(x::Integer, ::_Hex) = Char(x < 10 ? '0' + x : 'a' + (x - 10))
 _digitchar(x::Integer, ::_HEX) = Char(x < 10 ? '0' + x : 'A' + (x - 10))
 
-_signchar(x::Number, s::Char) = x < 0 ? '-' :
+_signchar(x::Real, s::Char) = signbit(x) ? '-' :
                                 s == '+' ? '+' :
                                 s == ' ' ? ' ' : '\0'
 

test/fmtspec.jl

@@ -95,6 +95,7 @@ fs = FormatSpec("d")
 
 @test fmt("", 0.125) == "0.125"
 @test fmt("f", 0.0) == "0.000000"
+@test fmt("f", -0.0) == "-0.000000"
 @test fmt("f", 0.001) == "0.001000"
 @test fmt("f", 0.125) == "0.125000"
 @test fmt("f", 1.0/3) == "0.333333"