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Found with readability-container-size-empty
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-using
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-override
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-equals-default
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Flag -n N repeats parsing N times.
Flag -c (--cache) caches the input in a string and uses that to parse.

On my Macbook Pro, reading from standard input incurs a bunch of locking
overhead, which complicates profiling and (IMO) adds noise to
results. This adds the option to read from a file, which doesn't incur
this overhead.

Add EmitterStyle, which will allow sequence or map style (i.e., flow or block) to be preserved between parsing and emitting

Added constructor to the Emitter with a stream, so you can write directly to a stream instead of our temp