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Illegal Sequence detection in ICU

Description

ICU currently does not detect illegal conversion sequence in the native data
stream. For example, the following was excepted from ibm-933:

<U00F3> \x3F # (SUB)
<U00F4> \x3F # (SUB)
<U00F5> \x3F # (SUB)
<U00F6> \x3F # (SUB)
<U00F9> \x3F # (SUB)
<U00FA> \x3F # (SUB)
<U00FB> \x3F # (SUB)
<U00FC> \x3F # (SUB)

there's no easy way to tell whether the mapping is unassigned, illegal or
replacement.

Please check if you can handle the replacement character/substitution correctly.

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TracBot

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