Changelog:
Changes affecting backwards compatibility
All strutils.rfind procs now take start and last like strutils.find with the same data slice/index meaning. This is backwards compatible for calls not changing the rfind start parameter from its default. (#11487)
In the unlikely case that you were using rfind X, start=N, or rfind X, N, then you need to change that to rfind X, last=N or rfind X, 0, N. (This should minimize gotchas porting code from other languages like Python or C++.)
On Windows stderr/stdout/stdin are not opened as binary files anymore. Use the switch -d:nimBinaryStdFiles for a transition period.
Breaking changes in the standard library
Mac OS X / BSD: TSa_Family is now the uint8 type, so type conversions like x.sin_family = uint16 toInt(nativesockets.AF_INET) need to be changed into x.sin_family = TSa_Family toInt(nativesockets.AF_INET).
Library additions
toOpenArray is now available for the JS target.
Library changes
Fix async IO operations stalling even after socket is closed. (#11232)
More informative error message for streams.openFileStream. (#11438)
Compiler changes
Better error message for IndexError for empty containers. (#11476)
Fix regression in semfold for old right shift. (#11477)
Fix for passing tuples as static params to macros. (#11423)
Bugfixes
Fixed "nimpretty goes crazy with this snippet" (#10295)
Fixed "nimpretty doesn't trim all whitespace on the right side of an export marker" (#10177)
Fixed "nimpretty gives invalid indentation to array elements" (#9505)
Fixed "nimpretty doesn't indent correctly if preceding line ends with ;, { etc" (#10159)
Fixed "Nimpretty wrong indentation for doc comments" (#10156)
Fixed "HttpClient Documentation needs Proxy example" (#11281)
Fixed "nimpretty aligns comment annoyingly" (#9399)
Fixed "ENDB missing from Docs and TheIndex, remove ENDB from -fullhelp" (#11431)
Fixed "Nimrod on Documentation generator" (#11460)
Fixed "nimpretty (de)indents code where it shouldn't" (#11468)
Fixed "nimpretty adds spaces where it shouldn't" (#11470)
Fixed "nimpretty formats enums differently based on commas" (#11467)
Fixed "strutils.rfind start parameter is unecessarily unusual" (#11430)
Fixed "TinyC is not documented" (#11495)
Fixed "c2nim missing from 0.20.0" (#11434)
Fixed "nimsuggest doesn't work unless compiled with -d:danger" (#11482)
Fixed "random.initRand crashes in Nim 0.20.0 JS backend" (#11450)
Fixed "0.20.0 fails to bootstrap when passing "-verbosity:2" (or 3) to koch" (#11436)
Fixed "Destructors lifting doesn't work with inheritance" (#11517)
Fixed "std/sums missing from TheIndex" (#11543)
Fixed "sequtils module: link is broken" (#11546)
Fixed "Case Statement Macros do not work in functions above exported functions." (#11556)
Fixed "newruntime: internal error when initializing a proc variable" (#11533)
Fixed "newruntime: error when modifying a sequence" (#11524)
Fixed "fmod and other math module functions are missing in js mode" (#4630)
Fixed "Object variants and new runtime" (#11563)
Fixed "newruntime exceptions" (#11577)
Fixed "nimpretty is not aware that the next line is a part of the same context" (#11469)
Fixed "Distinct procs fail to compile" (#11600)
Fixed "[SharedTables] Error: undeclared identifier: 'defaultInitialSize'" (#11588)
Fixed "newSeqOfCap is not working in newruntime" (#11098)
Fixed "nimpretty destroys source with a source code filter" (#11532)
Fixed "Unexpected behaviour when constructing with result" (#11525)
Fixed "Regression in 0.20.0: Nested proc using outer scope variable fails to compile" (#11523)
Fixed "os:standalone Error: redefinition of 'nimToCStringConv' " (#11445)
Fixed "No ambiguity error on field overloaded by field=" (#11514)
Fixed "object variants and new runtime part 2" (#11611)
Fixed "seq Error: unhandled exception: value out of range: 32772 " (#11606)
Fixed "Compiled binary includes full path to internal nim files" (#11572)
Fixed "Newruntime: top-level string variable is empty after an array assignment" (#11614)
Fixed "Newruntime: raise ObjContructor() doesn't compile" (#11628)
Fixed "Owned ref can be copied and causes double-free" (#11617)
Fixed "When compiling to JS (in -d:release) output contains toolchain path on dev's machine" (#11545)
Fixed "wrong unicode string output" (#11618)
Fixed "unittest "generic instantiation too nested" error" (#11515)
Fixed "Last read of a var parameter generates sink instead of assignment" (#11633)
Fixed "const table with proc type does not compile anymore" (#11479)
Fixed "Can't use offsetOf on object that ends with an UncheckedArray" (#11320)
Fixed "Newruntime/regression: Bad codegen for inline methods" (#11636)
Fixed "String or sequences inside a loop are not cleared in each iteration" (#11510)
Fixed "Nim -v doesn't acknowledge new danger flag" (#11484)
Fixed "SIGSEGV while compiling when trying to instantiate a case type, that uses an enum with nsage of parts of strutils fails when using -d:useNimRtl" (#8405)
Fixed "regression(0.20): finally block executed twice in VM" (#11610)
Fixed "exportc symbol not exported, leading to link error" (#11651)
Fixed "Render bug: opearatorasses refs across threads" (#7057)
Fixed "BUG: "varargs[string, $]" calls $ n^2 times instead of n times (n=len(varargs))" (#8316)
Fixed "Problem with the same name for module and exported type" (#3333)
Fixed "-gc:go does notles/objects fail with "non-trivial" error..." (#11671)
Fixed "Regression: parameter default value + typedesc parameter causes compiler crash" (#11660)
Fixed "newruntime: undetected dangling ref" (#11350)
Fixed "Newruntime: setLen() not working on sequences of owned refs" (#11530)
Fixed "Incorrect overflow/underflow error in case statements" (#11551)
Fixed "cgen preprocessor directive placed after struct declaration" (#11691)
Fixed "continue in an except Exception as e block crashes the compiler." (#11683)
Fixed "nimsuggest, nim check segfault when using bindSym and doAssert" (#10901)
Fixed "Nimpretty issue, multiline string of x length only causes output grow every time." (#11700)
Fixed "Array indexed by distinct int doesnt work with iterators" (#11715)
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