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When using mb_convert_encoding, check identified charset against list of available encodings (as mentioned in #107). If none match use US-ASCII if encoding is 7-bit; UTF-8 otherwise.
When using iconv, suppress errors and check if the function returns false.
NOTE: removed the try/catch blocks, since neither mb_convert_encoding nor iconv throw exceptions, in it's place, any (undesired?) error output is being suppressed with @