Issue #15544: Fix Decimal.__float__ to work with payload-carrying NaNs.
diff --git a/Lib/decimal.py b/Lib/decimal.py
index f5277c5..49de535 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -1555,7 +1555,13 @@
def __float__(self):
"""Float representation."""
- return float(str(self))
+ if self._isnan():
+ if self.is_snan():
+ raise ValueError("Cannot convert signaling NaN to float")
+ s = "-nan" if self._sign else "nan"
+ else:
+ s = str(self)
+ return float(s)
def __int__(self):
"""Converts self to an int, truncating if necessary."""