attempt a floating-point hack

Author: picnixz

Lib/_pydecimal.py

@@ -451,9 +451,12 @@ def IEEEContext(bits, /):
 # See https://github.com/python/cpython/issues/140036 for details.
 
 _LOG_10_BASE_2_LO = float.fromhex('0x1.a934f0979a371p+1')
+_LOG_10_BASE_2_LO -= _math.ulp(_LOG_10_BASE_2_LO) * 20
+assert _LOG_10_BASE_2_LO > 0
 assert pow(2, _LOG_10_BASE_2_LO) < 10
 
 _LOG_10_BASE_2_HI = float.fromhex('0x1.a934f0979a372p+1')
+_LOG_10_BASE_2_HI += _math.ulp(_LOG_10_BASE_2_HI) * 20
 assert pow(2, _LOG_10_BASE_2_HI) > 10