TruffleRuby - GraalVM Community Edition 1.0 RC14

Updated to Ruby 2.6.2.

Bug fixes:

• Implement rb_io_wait_writable (#1586).
• Fixed error when using arrows keys first within irb or pry (#1478, #1486).
• Coerce the right hand side for all BigDecimal operations (#1598).
• Combining multiple ** arguments containing duplicate keys produced an incorrect hash. This has now been fixed (#1469).
• IO#read_nonblock now returns the passed buffer object, if one is supplied.
• Worked out autoloading issue (#1614).

New features:

• Implemented String#delete_prefix, #delete_suffix, and related methods.
• Implemented Dir.children and Dir#children.
• Implemented Integer#sqrt.

Changes:

• -Xoptions has been removed - use --help:languages instead.
• -Xlog= has been removed - use --log.level= instead.
• -J has been removed - use --vm. instead.
• -J-cp lib.jar and so on have removed - use --vm.cp=lib.jar or --vm.classpath=lib.jar instead.
• --jvm. and --native. have been deprecated, use --vm. instead to pass VM options.
• -Xoption=value has been removed - use --option=value instead.
• The -X option now works as in MRI.
• --help:debug is now --help:internal.
• ripper is still not implemented, but the module now exists and has some methods that are implemented as no-ops.