0.34.0

Language changes

• (breaking-change) Exhaustive case expression check added, for now it produces warnings. (#8424, #8962, thanks @asterite, @Sija)
• Let Proc(T) be used as a Proc(Nil). (#8969, #8970, thanks @asterite)

Standard library

• (breaking-change) Replace Errno, WinError, IO::Timeout with RuntimeError, IO::TimeoutError, IO::Error, File::Error, Socket::Error, and subclasses. (#8885, thanks @waj)
• (breaking-change) Replace Logger module in favor of Log module. (#8847, #8976, thanks @bcardiff)
• (breaking-change) Move Adler32 and CRC32 to Digest. (#8881, thanks @bcardiff)
• (breaking-change) Remove DL module. (#8882, thanks @bcardiff)
• Enable more win32 specs. (#8683, #8822, thanks @straight-shoota)
• Make SemanticVersion::Prerelease comparable. (#8991, thanks @makenowjust)
• Use flag?(:i386) instead of obsolete flag?(:i686). (#8863, thanks @bcardiff)
• Remove Windows workaround using vsnprintf. (#8942, thanks @oprypin)
• Fixed docs broken link to ruby's prettyprint source. (#8915, thanks @MattHin)
• Update OptionParser example to exit on --help. (#8927, thanks @vlazar)

Numeric

• Fixed Float32#to_s corner-case. (#8838, thanks @toddsundsted)
• Fixed make Big*#to_u raise on negative values. (#8826, thanks @Sija)
• Fixed BigDecimal#to_big_i regression. (#8790, thanks @Sija)
• Add Complex#round. (#8819, thanks @miketheman)
• Add Int#bit_length and BigInt#bit_length. (#8924, #8931, thanks @asterite)
• Fixed docs of Int#gcd. (#8894, thanks @nard-tech)

Text

• (breaking-change) Deprecate top-level with_color in favor of Colorize.with. (#8892, #8958, thanks @bcardiff, @oprypin)
• Add overloads for String#ljust, String#rjust and String#center that take an IO. (#8923, thanks @asterite)
• Add missing Regex#hash and Regex::MatchData#hash. (#8986, thanks @makenowjust)
• Upgrade Unicode to 13.0.0. (#8906, thanks @Blacksmoke16)
• Revert deprecation of String#codepoint_at. (#8902, thanks @vlazar)
• Move Iconv to Crystal namespace. (#8890, thanks @bcardiff)

Collections

• Fixed make Range#size raise on an open range. (#8829, thanks @Sija)
• Add Enumerable#empty?. (#8960, thanks @Sija)
• (performance) Optimized Implementation of Array#fill for zero Values. (#8903, thanks @toddsundsted)
• Refactor Reflect to an Enumerable private definition. (#8884, thanks @bcardiff)

Serialization

• (breaking-change) Rename YAML::Builder.new with block to YAML::Builder.build. (#8896, thanks @straight-shoota)
• Add XML.build_fragment. (#8813, thanks @straight-shoota)
• Add CSV#rewind. (#8912, thanks @asterite)
• Add Deque#from_json and Deque#to_json. (#8850, thanks @carlhoerberg)
• Call to IO#flush on CSV, INI, JSON, XML, and YAML builders. (#8876, thanks @asterite)
• Add docs to Object.from_yaml. (#8800, thanks @wowinter13)

Time

• (breaking-change) Improve Time::Span initialization API with mandatory named arguments. (#8257, #8857, thanks @dnamsons, @bcardiff)
• Add Time::Span#total_microseconds. (#8966, thanks @vlazar)

Files

• Fixed multi-thread race condition by setting fd to -1 on closed File/Socket. (#8873, thanks @bcardiff)
• Fixed File.dirname with unicode chars. (#8911, thanks @asterite)
• Add IO::Buffered#flush_on_newline back and set it to true for non-tty. (#8935, thanks @asterite)
• Forward missing methods of IO::Hexdump to underlying IO. (#8908, thanks @carlhoerberg)

Networking

• (breaking-change) Correctly support WebSocket close codes. (#8975, #8981, thanks @RX14, @Sija)
• Make HTTP::Client return empty body_io if content-length is zero. (#8503, thanks @asterite)
• Fixed UDP specs in the case of a local firewall. (#8817, thanks @RX14)
• Fixed MIME spec examples to not collide with actual registry. (#8795, thanks @straight-shoota)
• Fixed UNIXServer, and HTTP::WebSocket specs to ensure server is accepting before closing. (#8755, #8879, thanks @bcardiff)
• Add type annotation to tls argument in HTTP. (#8678, thanks @j8r)
• Add Location to HTTP::Request common header names. (#8992, thanks @mamantoha)

Concurrency

• Add docs on Future regarding exceptions. (#8860, thanks @rdp)
• Disable occasionally failing Thread specs on musl. (#8801, thanks @straight-shoota)

System

• Fixed typo on src/signal.cr. (#8805, thanks @lbguilherme)

Runtime

• Fixed exceptions not being inspectable when running binary from PATH. (#8807, thanks @willhbr)
• Move AtExitHandlers to Crystal namespace. (#8883, thanks @bcardiff)

Compiler

• (breaking-change) Drop disable_overflow compiler flag. (#8772, thanks @Sija)
• Fixed url in "can't infer block return type" error message. (#8869, thanks @nilium)
• Fixed typo in math interpreter error message. (#8941, thanks @j8r)
• Use CRYSTAL_OPTS environment variable as default compiler options. (#8900, thanks @bcardiff)
• Avoid using the default --exclude-warnings value if some is specified. (#8899, thanks @bcardiff)
• Honor LIBRARY_PATH as default library path, and allow linking with no explicit /usr/lib:/usr/local/lib paths. (#8948, thanks @bcardiff)
• Fix Windows LLVM globals codegen in non-single-module mode. (#8978, thanks @oprypin)
• Add support for LLVM 10. (#8940, thanks @RX14)
• Remove redundant calls to Object.to_s in interpolation in compiler's code. (#8947, thanks @veelenga)

Language semantics

• Type as NoReturn if calling method on abstract class with no concrete subclasses. (#8870, thanks @asterite)

Tools

• Add crystal init name validation. (#8737, thanks @straight-shoota)

Doc generator

• Show warnings on docs command. (#8880, thanks @bcardiff)

Others

• CI improvements and housekeeping. (#8804, #8811, #8982, thanks @bcardiff, @oprypin)
• Update to Shards 0.10.0. (#8988, thanks @bcardiff)
• Fix pretty_json sample. (#8816, thanks @asterite)
• Fix typos throughout the codebase. (#8971, thanks @Sija)