Fix float_to_wire returning "-0"

hyperliquid/utils/signing.py

@@ -476,10 +476,11 @@ def float_to_wire(x: float) -> str:
     rounded = f"{x:.8f}"
     if abs(float(rounded) - x) >= 1e-12:
         raise ValueError("float_to_wire causes rounding", x)
-    if rounded == "-0":
-        rounded = "0"
     normalized = Decimal(rounded).normalize()
-    return f"{normalized:f}"
+    wire = f"{normalized:f}"
+    if wire == "-0":
+        wire = "0"
+    return wire
 
 
 def float_to_int_for_hashing(x: float) -> int:

tests/signing_test.py

@@ -9,6 +9,7 @@
     action_hash,
     construct_phantom_agent,
     float_to_int_for_hashing,
+    float_to_wire,
     order_request_to_order_wire,
     order_wires_to_order_action,
     sign_l1_action,
@@ -186,6 +187,15 @@ def test_float_to_int_for_hashing():
         float_to_int_for_hashing(0.000012312312)
 
 
+def test_float_to_wire_normalizes_negative_zero():
+    assert float_to_wire(-0.0) == "0"
+    assert float_to_wire(0.0) == "0"
+    assert float_to_wire(-1e-13) == "0"
+    assert float_to_wire(-1.5) == "-1.5"
+    assert float_to_wire(1.5) == "1.5"
+    assert float_to_wire(0.00001231) == "0.00001231"
+
+
 def test_sign_usd_transfer_action():
     wallet = eth_account.Account.from_key("0x0123456789012345678901234567890123456789012345678901234567890123")
     message = {