Remove `warn__identify_1pexp_bug` flag

aesara/configdefaults.py

@@ -1436,14 +1436,6 @@ def add_deprecated_configvars():
         in_c_key=False,
     )
 
-    # TODO: remove?
-    config.add(
-        "warn__identify_1pexp_bug",
-        "Warn if Aesara versions prior to 7987b51 (2011-12-18) could have "
-        "yielded a wrong result due to a bug in the is_1pexp function",
-        BoolParam(_warn_default("0.4.1")),
-        in_c_key=False,
-    )
     # TODO: this setting is not used anywhere
     config.add(
         "gpu__local_elemwise_fusion",

aesara/tensor/math_opt.py

@@ -3068,19 +3068,6 @@ def is_1pexp(t, only_process_constants=True):
                         scal_sum = scal_sum + s
                     if np.allclose(scal_sum, 1):
                         return False, maybe_exp.owner.inputs[0]
-                # Before 7987b51 there used to be a bug where *any* constant
-                # was considered as if it was equal to 1, and thus this
-                # function would incorrectly identify it as (1 + exp(x)).
-                if config.warn__identify_1pexp_bug:
-                    warnings.warn(
-                        "Although your current code is fine, please note that "
-                        "Aesara versions prior to 0.5 (more specifically, "
-                        "prior to commit 7987b51 on 2011-12-18) may have "
-                        "yielded an incorrect result. To remove this warning, "
-                        "either set the `warn__identify_1pexp_bug` config "
-                        "option to False, or `warn__ignore_bug_before` to at "
-                        "least '0.4.1'."
-                    )
     return None