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If object is a String object, returns object.
Otherwise if object responds to :to_str, calls object.to_str and returns the result.
Returns nil if object does not respond to :to_str.
Raises an exception unless object.to_str returns a String object.
               static VALUE
rb_str_s_try_convert(VALUE dummy, VALUE str)
    return rb_check_string_type(str);

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