Reviewed-by: okutsu

Reviewed-by: darcy, weijun

Summary: Add System.lineSeparator(), returning getProperty("line.separator")
Reviewed-by: darcy

Summary: Create fewer objects when parsing
Reviewed-by: sherman
Contributed-by: NDaniel Martin <dtm@google.com>

Summary: throw appropriate exception when necessary
Reviewed-by: alanb

Reviewed-by: alanb

Summary: Correct the wrong calculation of "precision" in certain circumstances.
Reviewed-by: darcy, alanb