[slf4j-user] Classes in org.slf4j.helpers: API? SPI? Neither?

[Dale Wijnand]

Hi,
I was wondering if the classes under org.slf4j.helpers (such as
MessageFormatter) are to be considered:
* Public API
* SPI (for binding modules)
* Internal code

I ask, because MessageFormatter#format(String, Object) broken compatibility
in v1.6..

Thanks in advance,
Dale
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