fix unwanted trailing-space

Author: linkdata

README.md

@@ -20,6 +20,9 @@ a maximum of six characters while still showing as much precision as possible.
 The highest byte count printable is 268435440QB (Quetta-bytes, 10³⁰),
 exceeding this will print `+InfQB`.
 
+`bytecount.Value` stores values as `float32`. Exact integer precision is therefore limited
+to 24 bits (16,777,216). Above that, neighboring integer byte counts may format identically.
+
 If the formatting verb is `d` (e.g. `"%d"`), the divisor is 1000 rather than 1024.
 
 If the formatting verb is `b` (e.g. `"%b"`), the value is multiplied by 8 and the

value.go

@@ -73,7 +73,7 @@ func (v Value) Format(f fmt.State, verb rune) {
 		}
 		buf = buf[1:]
 	}
-	if f.Flag(' ') {
+	if f.Flag(' ') && (scale != 0 || unit != 0) {
 		buf = append(buf, ' ')
 	}
 	if scale != 0 {

value_test.go

@@ -55,6 +55,11 @@ func TestValue_Format(t *testing.T) {
 			f:    "%#-5.1v",
 			v:    1,
 		},
+		{
+			name: "1",
+			f:    "% #v",
+			v:    1,
+		},
 		{
 			name: "-01B",
 			f:    "%04v",