slf4j-timber/src/main/java/org/slf4j/impl/TimberAndroidLoggerAdapter.java
public void debug(String format, Object... argArray) {
        formatAndLog(Log.DEBUG, format, argArray);
    }
public void debug(String format, Object... argArray) {
        formatAndLog(Log.DEBUG, format, argArray);
    }
Log a message at level DEBUG according to the specified format and
arguments.
<p>
<p>
This form avoids superfluous object creation when the logger is disabled
for the DEBUG level.
</p>

@param format   the format string
@param argArray an array of arguments