Stop EWW network statistics changing width

eww/scripts/network-statistics-shell.sh

@@ -1,4 +1,4 @@
 #!/bin/env sh
 
 # EWW doesn't seem to like listening to Python scripts directly, but this wrapper seems to work fine
-"$(dirname "$0")"/network-statistics "$@"
+python -OO "$(dirname "$0")"/network_statistics.py "$@"

eww/scripts/network_statistics.py

@@ -35,10 +35,12 @@ class Status:
 
 
 def format_4_significant_digits(num: float) -> str:
-	if num < 100:
-		return f"{num:#.3g}"
+	assert num >= 1.0, "Doesn't properly handle numbers below 1"
+	if num < 999:
+		return f"{num:04.3g}"
 	if num < 1000:
-		return f" {num:.3g}"
+		# Above doesn't nicely handle the special case in [999.5 1000)
+		return "0999"
 	return f"{num:.4g}"