One more UnitStep example...

and module I forgot to "git add"
Mathics3 · Dec 28, 2024 · 440ac6b · 440ac6b
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diff --git a/mathics/builtin/numeric.py b/mathics/builtin/numeric.py
@@ -811,7 +811,10 @@ class UnitStep(Builtin):
     >> UnitStep[0.7]
      = 1
 
-    We can use 'UnitStep' on irrational numbers:
+    We can use 'UnitStep' on irrational numbers and infinities:
+    >> Map[UnitStep, {Pi, Infinity, -Infinity}]
+     = {1, 1, 0}
+
     >> Table[UnitStep[x], {x, -3, 3}]
      = {0, 0, 0, 1, 1, 1, 1}