Tests failing occasionally with "surrogates not allowed"

[Uwe L. Korn]

________________________________ test_utf8_size ________________________________

>   ???

tests/test_text.py:430: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

char = '\ud800'

    @settings(deadline=None)
    @given(char=st.characters())
    def test_utf8_size(char):
>       char_bytes = char.encode("utf-8")
E       UnicodeEncodeError: 'utf-8' codec can't encode character '\ud800' in position 0: surrogates not allowed

tests/test_text.py:432: UnicodeEncodeError
---------------------------------- Hypothesis ----------------------------------
Falsifying example: test_utf8_size(
    char='\ud800',
)

[Uwe L. Korn]

Should be fixed in master.