changelog.md

v0.18.0 - dd/mm/yyyy

Changes affecting backwards compatibility

• Removed basic2d/basic3d out of the stdlib and into Nimble packages. These packages deprecated however, use the glm, arraymancer, neo or another package.
• Arrays of char cannot be converted to cstring anymore, pointers to arrays of char can! This means $ for arrays can finally exist in system.nim and do the right thing.
• echo now works with strings that contain \0 (the binary zero is not shown) and nil strings are equal to empty strings.
• JSON: Deprecated getBVal, getFNum, and getNum in favour to getBool, getFloat, getBiggestInt. Also getInt procedure was added.
• reExtended is no longer default for the re constructor in the re module.
• The overloading rules changed slightly so that constrained generics are preferred over unconstrained generics. (Bug #6526)
• It is now possible to forward declare object types so that mutually recursive types can be created across module boundaries. See package level objects for more information.
• The unary < is now deprecated, for .. < use ..< for other usages use the pred proc.
• We changed how array accesses "from backwards" like a[^1] or a[0..^1] are implemented. These are now implemented purely in system.nim without compiler support. system.Slice now takes 2 generic parameters so that it can take BackwardsIndex indices. BackwardsIndex is produced by system.^. This means if you overload [] or []= you need to ensure they also work with system.BackwardsIndex (if applicable for the accessors).
• mod and bitwise and do not produce range subtypes anymore. This turned out to be more harmful than helpful and the language is simpler without this special typing rule.
• Added algorithm.rotateLeft.
• rationals.toRational now uses an algorithm based on continued fractions. This means its results are more precise and it can't run into an infinite loop anymore.
• Added typetraits.$ as an alias for typetraits.name.