x.x - xxxx-xx-xx

Changes affecting backwards compatibility

Breaking changes in the standard library

base64.encode no longer supports lineLen and newLine. Use base64.encodeMIME instead.
os.splitPath() behavior synchronized with os.splitFile() to return "/" as the dir component of "/root_sub_dir" instead of the empty string.
sequtils.zip now returns a sequence of anonymous tuples i.e. those tuples now do not have fields named "a" and "b".
strutils.formatFloat with precision = 0 has the same behavior in all backends, and it is compatible with Python's behavior, e.g. formatFloat(3.14159, precision = 0) is now 3, not 3..

Breaking changes in the compiler

Implicit conversions for const behave correctly now, meaning that code like const SOMECONST = 0.int; procThatTakesInt32(SOMECONST) will be illegal now. Simply write const SOMECONST = 0 instead.

Library additions

macros.newLit now works for ref object types.
system.writeFile has been overloaded to also support openarray[byte].
Added overloaded strformat.fmt macro that use specified characters as delimiter instead of '{' and '}'.

Library changes

asyncdispatch.drain now properly takes into account selector.hasPendingOperations and only returns once all pending async operations are guaranteed to have completed.
asyncdispatch.drain now consistently uses the passed timeout value for all iterations of the event loop, and not just the first iteration. This is more consistent with the other asyncdispatch apis, and allows asyncdispatch.drain to be more efficient.
base64.encode and base64.decode was made faster by about 50%.
htmlgen adds MathML support (ISO 40314).

Language additions

Language changes

Unsigned integer operators have been fixed to allow promotion of the first operand.

Tool changes

Compiler changes

JS target indent is all spaces, instead of mixed spaces and tabs, for generated JavaScript.

Bugfixes

The FD variant of selector.unregister for ioselector_epoll and ioselector_select now properly handle the Event.User select event type.