gh-77748: Document that float() accepts bytes-like objects

Doc/library/functions.rst

@@ -778,7 +778,7 @@ are always available.  They are listed here in alphabetical order.
       single: NaN
       single: Infinity
 
-   Return a floating-point number constructed from a number or a string.
+   Return a floating-point number constructed from a number, a string, or a bytes-like object.
 
    Examples:
 
@@ -794,6 +794,10 @@ are always available.  They are listed here in alphabetical order.
       1000000.0
       >>> float('-Infinity')
       -inf
+      >>> float(b'3.2e2')
+      320.0
+      >>> float(bytearray(b'-2.5'))
+      -2.5
 
    If the argument is a string, it should contain a decimal number, optionally
    preceded by a sign, and optionally embedded in whitespace.  The optional
@@ -819,6 +823,9 @@ are always available.  They are listed here in alphabetical order.
    Case is not significant, so, for example, "inf", "Inf", "INFINITY", and
    "iNfINity" are all acceptable spellings for positive infinity.
 
+   If the argument is a bytes-like object, it must contain only ASCII characters
+   that conform to the :token:`~float:floatvalue` rule.
+
    Otherwise, if the argument is an integer or a floating-point number, a
    floating-point number with the same value (within Python's floating-point
    precision) is returned.  If the argument is outside the range of a Python

Objects/floatobject.c

@@ -1560,12 +1560,12 @@ float.__new__ as float_new
     x: object(c_default="NULL") = 0
     /
 
-Convert a string or number to a floating-point number, if possible.
+Convert a string, number, or bytes-like object to a float, if possible.
 [clinic start generated code]*/
 
 static PyObject *
 float_new_impl(PyTypeObject *type, PyObject *x)
-/*[clinic end generated code: output=ccf1e8dc460ba6ba input=55909f888aa0c8a6]*/
+/*[clinic end generated code: output=ccf1e8dc460ba6ba input=27eb1f7c62226a39]*/
 {
     if (type != &PyFloat_Type) {
         if (x == NULL) {