No shorthand methods (info, debug, warning, …) or LoggerAdapter.
log() returns the formatted string instead of None, and there is no
Logger.isEnabledFor() helper.
Records lack extra, exc_info, stack_info, and stack introspection.
Handlers expect handle(logger, level, message) rather than emit(LogRecord)
and run on dedicated worker threads, so Python logging.Handler subclasses
cannot be reused.
The dictConfig schema lacks incremental updates, filters, handler levels,
and formatter attachment. fileConfig is likewise cut down.
Queue capacity is capped (1 024 per logger/handler). The stdlib blocks the
emitting thread; femtologging drops records and emits warnings instead.
Formatting styles (%, {}, $) are not implemented. Provide the final
string yourself, or supply a callable formatter per handler.
The logging manager is separate from logging’s global state. Mixing both
systems in the same process is unsupported.