wrong result for difflib.SequenceMatcher

[BorisYang]

BPO	35287

^{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 2018-11-21.07:16:49.955>
created_at = <Date 2018-11-21.07:13:26.940>
labels = ['type-bug', '3.7']
title = 'wrong result for difflib.SequenceMatcher'
updated_at = <Date 2018-11-21.07:16:49.954>
user = 'https://bugs.python.org/BorisYang'

bugs.python.org fields:

activity = <Date 2018-11-21.07:16:49.954>
actor = 'Boris Yang'
assignee = 'none'
closed = True
closed_date = <Date 2018-11-21.07:16:49.955>
closer = 'Boris Yang'
components = []
creation = <Date 2018-11-21.07:13:26.940>
creator = 'Boris Yang'
dependencies = []
files = []
hgrepos = []
issue_num = 35287
keywords = []
message_count = 1.0
messages = ['330173']
nosy_count = 1.0
nosy_names = ['Boris Yang']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35287'
versions = ['Python 3.7']

[BorisYang]

How to repeat:

from difflib import SequenceMatcher
seqMatcher = SequenceMatcher(None, "德阳孩子", "孩子德阳")
seqMatcher.get_matching_blocks()

Expect Result:
[Match(a=0, b=3, size=2), Match(a=2, b=0, size=2), Match(a=5, b=5, size=0)]

Current Result:
[Match(a=0, b=3, size=2), Match(a=5, b=5, size=0)]