TypeError does not work when function with type hint

[KyeongpilKang]

BPO	32191
Nosy	@Kyeongpil Kang

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-12-01.07:36:11.116>
created_at = <Date 2017-12-01.07:18:25.329>
labels = ['ctypes', 'type-bug', 'invalid']
title = 'TypeError does not work when function with type hint'
updated_at = <Date 2017-12-01.12:13:25.692>
user = 'https://github.com/KyeongpilKang'

bugs.python.org fields:

activity = <Date 2017-12-01.12:13:25.692>
actor = 'eric.smith'
assignee = 'none'
closed = True
closed_date = <Date 2017-12-01.07:36:11.116>
closer = 'Kang'
components = ['ctypes']
creation = <Date 2017-12-01.07:18:25.329>
creator = 'Kang'
dependencies = []
files = []
hgrepos = []
issue_num = 32191
keywords = []
message_count = 2.0
messages = ['307367', '307369']
nosy_count = 1.0
nosy_names = ['Kang']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32191'
versions = ['Python 3.6']

[KyeongpilKang]

TypeError does not work when I input float variable into function that I give type hint.

example code is like this:
def a(b: int) -> int:
return b+1

a(1.1)

and the result is 1.1.
However, I think it should throw TypeError Exception because type of input is float, not int.

[KyeongpilKang]

Oh, I confused the syntax of type hint.
Sorry