# -*- rdoc -*-
This document is a list of user visible feature changes made between releases except for bug fixes.
Note that each entry is kept so brief that no reason behind or reference information is supplied with. For a full list of changes with all sufficient information, see the ChangeLog file or Redmine (e.g. https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER)
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Top-level constant look-up is removed. [Feature #11547]
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rescue/else/ensure are allowed inside do/end blocks. [Feature #12906]
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Array
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Array#append [Feature #12746]
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Array#prepend [Feature #12746]
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Integer
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Integer.sqrt [Feature #13219]
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Integer#step does no longer rescue exceptions when given a step value which cannot be compared with #> to 0. [Feature #7688]
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IO
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IO#pread [Feature #4532]
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IO#pwrite [Feature #4532]
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IOError
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exception message “stream closed” is changed [Bug #13405]
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Kernel
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Kernel#yield_self [Feature #6721]
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Numeric
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Numerical comparison operators (<,<=,>=,>) no longer rescue exceptions of #coerce. Return nil in #coerce if the coercion is impossible.
- Feature #7688
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Range
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Range#initialize no longer rescue exceptions when comparing begin and end with #<=> and raise a “bad value for range” ArgumentError but instead let the exception from the #<=> call go through.
- Feature #7688
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Regexp
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Update Onigmo 6.1.1.
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Support absent operator github.com/k-takata/Onigmo/issues/82
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Thread
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Thread#fetch [Feature #13009]
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String
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String#-@ deduplicates unfrozen strings. Already-frozen strings remain unchanged for compatibility. [Feature #13077]
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-“literal” (String#-@) optimized to return the same object (same as “literal”.freeze in Ruby 2.1+) [Feature #13295]
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Net::HTTP
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Net::HTTP#proxy_user and Net::HTTP#proxy_pass now reflects http_proxy environment variable if the system’s environment variable is multiuser safe. [Bug #12921]
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RbConfig
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New constants:
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RbConfig::LIMITS is added to provide the limits of C types.
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Random.raw_seed renamed to become Random.urandom. It is now applicable to non-seeding purposes due to [Bug #9569].
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BasicSocket#read_nonblock and BasicSocket#write_nonblock no longer sets the O_NONBLOCK file description flag as side effect
- Feature #13362
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mathn.rb Removed from stdlib. [Feature #10169]
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(This might not be a “user visible feature change” but) Hash class’s hash function is now SipHash13. [Feature #13017]
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SecureRandom now prefers OS-provided sources than OpenSSL. [Bug #9569]
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configure option –with-ext now mandates its arguments. So for instance if you run ./configure –with-ext=openssl,+ then the openssl library is guaranteed compiled, otherwise the build fails abnormally.
Note however to always add the “,+” at the end of the argument. Otherwise nothing but openssl are built. [Feature #13302]