Today marks the release of Ruby version 2.1.0. A brief list of changes since 2.0.0 has been posted, and file downloads are available. Here are some of the changes: Now the default values of keyword arguments can be omitted. Those 'required keyword arguments" need giving explicitly at the call time.Added suffixes for integer and float literals: 'r', 'i', and 'ri'.def-expr now returns the symbol of its name instead of nil.rb_profile_frames() added. Provides low-cost access to the current ruby stack for callstack profiling. introduced the generational GC a.k.a RGenGC (PDF).

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