Issue python#28792: Remove aliases from _bisect

Remove aliases from the C module. Always implement bisect() and insort()
aliases in bisect.py

Remove also the "# backward compatibility" command, there is no plan to
deprecate nor remove these aliases. When keys are equal, it makes sense to use
bisect.bisect() and bisect.insort().

Lib/bisect.py

@@ -19,8 +19,6 @@ def insort_right(a, x, lo=0, hi=None):
         else: lo = mid+1
     a.insert(lo, x)
 
-insort = insort_right   # backward compatibility
-
 def bisect_right(a, x, lo=0, hi=None):
     """Return the index where to insert item x in list a, assuming a is sorted.
 
@@ -42,8 +40,6 @@ def bisect_right(a, x, lo=0, hi=None):
         else: lo = mid+1
     return lo
 
-bisect = bisect_right   # backward compatibility
-
 def insort_left(a, x, lo=0, hi=None):
     """Insert item x in list a, and keep it sorted assuming a is sorted.
 
@@ -90,3 +86,7 @@ def bisect_left(a, x, lo=0, hi=None):
     from _bisect import *
 except ImportError:
     pass
+
+# Create aliases
+bisect = bisect_right
+insort = insort_right

Modules/_bisectmodule.c

@@ -216,18 +216,11 @@ If x is already in a, insert it to the left of the leftmost x.\n\
 Optional args lo (default 0) and hi (default len(a)) bound the\n\
 slice of a to be searched.\n");
 
-PyDoc_STRVAR(bisect_doc, "Alias for bisect_right().\n");
-PyDoc_STRVAR(insort_doc, "Alias for insort_right().\n");
-
 static PyMethodDef bisect_methods[] = {
     {"bisect_right", (PyCFunction)bisect_right,
         METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
-    {"bisect", (PyCFunction)bisect_right,
-        METH_VARARGS|METH_KEYWORDS, bisect_doc},
     {"insort_right", (PyCFunction)insort_right,
         METH_VARARGS|METH_KEYWORDS, insort_right_doc},
-    {"insort", (PyCFunction)insort_right,
-        METH_VARARGS|METH_KEYWORDS, insort_doc},
     {"bisect_left", (PyCFunction)bisect_left,
         METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
     {"insort_left", (PyCFunction)insort_left,