Nim/changelog.md

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.

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.