Append a char
Append a string
Append a string
the string to append
return the underlying object
Some appenders allow for flushing or require it, this ensures they can do so
Some appenders are really builders, they get to provid their result with this
An Appendable is an abstraction over a writer and other things that might side effect when writing. Appendables only produce string values
the type of output sources this appender uses