Basic support for uplevel: keyword argument in Kernel#warn (#2006)
Added a #respond_to_missing? implementation for BasicObject, Delegator, OpenStruct, that's meant for future support in the Opal runtime, which currently ignores it (#2007)
Opal::Compiler#magic_comments that allows to access magic-comments format and converts it to a hash (#2038)
Use magic-comments to declare helpers required by the file (#2038)
Opal.$$ is now a shortcut for Opal.const_get_relative (#2038)
Opal.$$$ is now a shortcut for Opal.const_get_qualified (#2038)
Added support for globalThis as the generic global object accessor (#2047)
Opal::Compiler#magic_comments that allows to access magic-comments format and converts it to a hash
Use magic-comments to declare helpers required by the file
Opal.$$ is now a shortcut for Opal.const_get_relative
Opal.$$$ is now a shortcut for Opal.const_get_qualified
Source-map support for Node.js in the default runner (#2045)
SecureRandom#hex(n) (#2050)
Added a generic implementation of Kernel#caller and #warn(uplevel:) that works with sourcemaps in Node.js and Chrome (#2065)

Array#delete_if (#2069)
Array#keep_if (#2069)
Array#reject! (#2069)
Array#select! (#2069)
Struct#dup (#1995)
Integer#gcdlcm (#1972)
Enumerable#to_h (#1979)
Enumerator#size (#1980)
Enumerable#min (#1982)
Enumerable#min_by (#1985)
Enumerable#max_by (#1985)
Set#intersect? (#1988)
Set#disjoint? (#1988)
Set#keep_if (#1987)
Set#select! (#1987)
Set#reject! (#1987)
Module#alias_method (#1983)
Enumerable#minmax_by (#1981)
Enumerator#each_with_index (#1990)
Range#== (#1992)
Range#each (#1991)
Enumerable#zip (#1986)
Struct#dup not copying $$data (#1995)
Fixed usage of semicolon in single-line backticks (#2004)
Module#attr with multiple arguments (#2003)
PathReader used to try to read missing files instead of respecting the missing_require_severity configuration value (#2044)
Removed some unused variables from the runtime (#2052)
Fixed a typo in the runtime (#2054)
Fix Regexp interpolation, previously interpolating with other regexps was broken (#2062)
Set match on StringScanner#skip and StringScanner#scan_until (#2061)
Fix ruby 2.7 warnings (#2071)

Updated outdated parser version (#2013)
Nashorn has been deprecated but GraalVM still supports it (#1997)
"opal/mini" now includes "opal/io" (#2002)
Regexps assigned to constants are now frozen (#2007)
Opal.$$ changed from being the constant cache of Object to being a shortcut for Opal.const_get_relative (#2038)
Moved REPL implementation from bin/ to its own lib/ file as opal/repl.rb (#2048)
Encoding.default_external is now initialized with __ENCODING__ (#2072)
Keep the MersenneTwister implementation private (#2108)

Requiring nodejs/stacktrace has been deprecated, source-maps are already supported by the default Node.js runner or by requiring https://github.com/evanw/node-source-map-support before loading code compiled by Opal (#2045)

Removed special compilation for the Opal.truthy? and Opal.falsy? helpers (#2076)

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