> ## Documentation Index
> Fetch the complete documentation index at: https://companyname-a7d5b98e-nft-comparison.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

## v1.2

1. Breaking change: `address` is now "internal only" ([details and migration](https://github.com/ton-blockchain/ton/pull/1886))
2. Rich bounces: not 256 bits, but the full body on bounce
3. Cheap builder-to-slice, `StateInit`, and address composition
4. Compilation errors significantly improved
5. Anonymous functions supported
6. Borrow checker and other stuff related to undefined behavior

## v1.1

1. `map<K, V>` — a convenient zero-overhead wrapper over TVM dictionaries
2. `enum` — group numeric constants into a distinct type
3. `private` and `readonly` fields in structures
4. Enhanced overload resolution and partial specialization

## v1.0

1. The magic `lazy` keyword — lazy loading, partial loading, partial updating
2. Auto-detect and inline functions at the compiler level
3. Various peephole optimizations for gas efficiency
4. `onInternalMessage` and `onBouncedMessage`, TVM 11 support
5. Custom pack/unpack serializers for custom types

## v0.99

1. Universal `createMessage`
2. Universal `createExternalLogMessage`
3. Sharding — calculate addresses "close to another contract"

## v0.13

1. Auto-packing to/from cells/builders/slices
2. Type `address`
3. Lateinit variables
4. Defaults for parameters

## v0.12

1. Structures `struct A { ... }`
2. Generics `struct<T>` and `type<T>`
3. Methods `fun Point.getX(self)`
4. Rename stdlib functions to short methods

## v0.11

1. Type aliases `type NewName = <existing type>`
2. Union types `T1 | T2 | ...`
3. Pattern matching for types
4. Operators `is` and `!is`
5. Pattern matching for expressions
6. Semicolon for the last statement in a block can be omitted

## v0.10

1. Fixed-width integers: `int32`, `uint64`, etc. [Details](https://github.com/ton-blockchain/ton/pull/1559)
2. Type `coins` and function `ton("0.05")`
3. `bytesN` and `bitsN` types (backed by slices at TVM level)
4. Replace `"..."c` postfixes with `stringCrc32("...")` functions
5. Support `0b...` number literals along with `0x...`
6. Trailing comma support

## v0.9

1. Nullable types `int?`, `cell?`, etc.; null safety
2. Standard library (asm definitions) updated to reflect nullability
3. Smart casts, like in TypeScript in Kotlin
4. Operator `!` (non-null assertion)
5. Code after `throw` is treated as unreachable
6. The `never` type

## v0.8

1. Syntax `tensorVar.0` and `tupleVar.0` (both for reading and writing)
2. Allow `cell`, `slice`, etc. to be valid identifiers (not keywords)

## v0.7

1. Under the hood: refactor compiler internals; AST-level semantic analysis kernel
2. Under the hood: rewrite the type system to static typing
3. Clear and readable error messages on type mismatch
4. Generic functions `fun f<T>(...)` and instantiations like `f<int>(...)`
5. The `bool` type; type casting via `value as T`

## v0.6

The first public release. Here are some notes about its origin: