I was trying to import a bts account but it failed with not accepting certain a character. I have a special char in my password.
Unexpected char '11111111' in ""
    {"c":111111111,"s":""}
    th_a  json_relaxed.hpp:738 variant_from_stream
    {"str":"import_accounts  backup.json xxxxx"}
    th_a  json.cpp:494 variants_from_string
Note: password and invalid char code are masked.