# -*- 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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Integer
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Integer.sqrt [Feature #13219]
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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+)
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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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(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]