Bugfix: Python interface declaration rfc_counts_v()

Author: a-ma72

src/python/rfcnt.pyi

@@ -3,9 +3,11 @@ from typing import Optional, Union
 from . import ArrayLike, LCMethod, ResidualMethod, SDMethod
 
 
-def rfc(data: ArrayLike,
+def rfc(
+        data: ArrayLike,
+        class_width: float,
+        *,
         class_count: Optional[int] = 100,
-        class_width: Optional[float] = None,
         class_offset: Optional[float] = None,
         hysteresis: Optional[float] = None,
         residual_method: Optional[Union[int, ResidualMethod]] = ResidualMethod.REPEATED,

src/python/src/rfcnt.cpp

@@ -205,9 +205,9 @@ int parse_rfc_kwargs( PyObject* kwargs, Py_ssize_t len, Rainflow *rf, Rainflow::
 {
     PyObject   *empty           =  PyTuple_New(0);
     int         class_count     =  100;
-    double      class_width     = -1;  // -1 = "calculated"
+    double      class_width     =  1;  // will be overwritten by required argument
     double      class_offset    =  0;
-    double      hysteresis      = -1;  // -1 = "calculated"
+    double      hysteresis      = -1;  // -1 => "use class_width as hysteresis"
     int         enforce_margin  =  1;  // true
     int         use_hcm         =  0;  // false
     int         use_astm        =  0;  // false