Prefer `type(x) is int` to `isinstance(x, int)` (#14945)

* Perfer `type(x) is int` to `isinstance(x, int)`

This covered all additional instances I could see where `x` was
user-controlled.
The remaining cases are

```
$ rg -s 'isinstance.*[^_]int'
tests/replication/_base.py
576:        if isinstance(obj, int):

synapse/util/caches/stream_change_cache.py
136:        assert isinstance(stream_pos, int)
214:        assert isinstance(stream_pos, int)
246:        assert isinstance(stream_pos, int)
267:        assert isinstance(stream_pos, int)

synapse/replication/tcp/external_cache.py
133:        if isinstance(result, int):

synapse/metrics/__init__.py
100:        if isinstance(calls, (int, float)):

synapse/handlers/appservice.py
262:        assert isinstance(new_token, int)

synapse/config/_util.py
62:        if isinstance(p, int):
```

which cover metrics, logic related to `jsonschema`, and replication and
data streams. AFAICS these are all internal to Synapse

* Changelog

1 files changed, 3 insertions, 3 deletions

diff --git a/synapse/rest/admin/users.py b/synapse/rest/admin/users.py
index 6e0c44be2a..0841b89c1a 100644
--- a/synapse/rest/admin/users.py
+++ b/synapse/rest/admin/users.py
@@ -973,7 +973,7 @@ class UserTokenRestServlet(RestServlet):
         body = parse_json_object_from_request(request, allow_empty_body=True)
 
         valid_until_ms = body.get("valid_until_ms")
-        if valid_until_ms and not isinstance(valid_until_ms, int):
+        if type(valid_until_ms) not in (int, type(None)):
             raise SynapseError(
                 HTTPStatus.BAD_REQUEST, "'valid_until_ms' parameter must be an int"
             )
@@ -1125,14 +1125,14 @@ class RateLimitRestServlet(RestServlet):
         messages_per_second = body.get("messages_per_second", 0)
         burst_count = body.get("burst_count", 0)
 
-        if not isinstance(messages_per_second, int) or messages_per_second < 0:
+        if type(messages_per_second) is not int or messages_per_second < 0:
             raise SynapseError(
                 HTTPStatus.BAD_REQUEST,
                 "%r parameter must be a positive int" % (messages_per_second,),
                 errcode=Codes.INVALID_PARAM,
             )
 
-        if not isinstance(burst_count, int) or burst_count < 0:
+        if type(burst_count) is not int or burst_count < 0:
             raise SynapseError(
                 HTTPStatus.BAD_REQUEST,
                 "%r parameter must be a positive int" % (burst_count,),