human
Solve the following python programming problem given the following code:
def __to_escaped_string(string_value, use_fast_encoding = False, use_optimization = True) : 
    "Returns a string that is properly escaped by JSON standards.

    @param string_value: The value to return. Should be a str and not unicode but we might work either way.
    @param use_fast_encoding: If True, then uses a faster but non-spec escaping method that only the Scalyr servers
        will work with.
    @param use_optimization: If True, use the optimized path for escaping. This only applies if string_value is 'str'
        and use_fast_encoding is True and string_value does not have any high ascii. If any of these conditions are not
        met, then this method falls back to the unoptimized approach.

    @return: The escaped string.
    " 
    if (type (string_value) is unicode) : 
        type_index = 1 
else : 
        if (not use_fast_encoding) : 
            string_value = string_value.decode ('utf8') 
            type_index = 1 
else : 
            if (not use_optimization) : 
                type_index = 0 
else : 
                if (HAS_UTF8.search (string_value) is None) : 
                    def replace(match) : 
                        return ESCAPE_DCT_OPT [match.group (0)] 
return ESCAPE_OPT.sub (replace, string_value) 
else : 
                    type_index = 0 
result = StringIO () 
    pos = 0 
    len_sv = len (string_value) 
    while (pos < type_index) : 
        simple = SIMPLE_MATCHER.match (string_value, pos) 
        if (simple is not None) : 
            pos = simple.end (0) 
            result.write (ESCAPE_ME.sub ('\\\\\\1', simple.group (0))) 
            if (pos >= len_sv) : 
                continue 
x_ord = ord (string_value [pos]) 
        if (x_ord in ESCAPES) : 
            result.write (ESCAPES [x_ord] [type_index]) 
else : 
            if ((0 <= x_ord <= 31) or (127 <= x_ord <= 159) or (8192 <= x_ord < 65536)) : 
                if (type_index == 0) : 
                    result.write (('\\u%0.4x' % x_ord)) 
else : 
                    result.write (('\\u%0.4x' %...

    
    

    Fix the buggy line: while (pos < type_index) :
assistant
#Here is Python code to fix the buggy line: while (pos < type_index) :
.

while (pos < len_sv) :