some new features

.venv/lib/python3.12/site-packages/Cython/Includes/libc/float.pxd

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+# 5.2.4.2.2 Characteristics of floating types <float.h>
+
+cdef extern from "<float.h>":
+
+    const float FLT_RADIX
+
+    const float FLT_MANT_DIG
+    const double DBL_MANT_DIG
+    const long double LDBL_MANT_DIG
+
+    const double DECIMAL_DIG
+
+    const float FLT_DIG
+    const double DBL_DIG
+    const long double LDBL_DIG
+
+    const float FLT_MIN_EXP
+    const double DBL_MIN_EXP
+    const long double LDBL_MIN_EXP
+
+    const float FLT_MIN_10_EXP
+    const double DBL_MIN_10_EXP
+    const long double LDBL_MIN_10_EXP
+
+    const float FLT_MAX_EXP
+    const double DBL_MAX_EXP
+    const long double LDBL_MAX_EXP
+
+    const float FLT_MAX_10_EXP
+    const double DBL_MAX_10_EXP
+    const long double LDBL_MAX_10_EXP
+
+    const float FLT_MAX
+    const double DBL_MAX
+    const long double LDBL_MAX
+
+    const float FLT_EPSILON
+    const double DBL_EPSILON
+    const long double LDBL_EPSILON
+
+    const float FLT_MIN
+    const double DBL_MIN
+    const long double LDBL_MIN