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chore[release]: Tact v1.6.0 (#2091)
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Diff for: ‎dev-docs/CHANGELOG.md

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## [Unreleased]
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## [1.6.0] - 2025-02-28
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### Language features
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- Added `&&=`, `||=`, `>>=` and `<<=` augmented assignment operators: PR [#853](https://github.com/tact-lang/tact/pull/853)

Diff for: ‎docs/src/content/docs/book/config.mdx

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#### `safety` {#options-safety}
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Options that affect the safety of contracts.
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##### `nullChecks` {#safety-nullChecks}
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`true{:json}` by default.
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#### `optimizations` {#options-optimizations}
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Options that affect the optimizations of contracts.
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##### `alwaysSaveContractData` {#optimizations-alwayssavecontractdata}
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`false{:json}` by default.
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#### `enableLazyDeploymentCompletedGetter` {#options-enablelazydeploymentcompletedgetter}
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`false{:json}` by default.
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### `verbose` {#verbose}
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`1{:json}` by default.
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Diff for: ‎docs/src/content/docs/book/contracts.mdx

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### Contract parameters {#parameters}
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Most of the contracts do not need any on-chain deployment logic that runs just once after the contract's deployment is completed. As such, the costly lazy deployment strategy provided by the [`init(){:tact}`](#init-function) is generally discouraged in favor of simple, direct deployments with [initial code and initial data](/book/expressions#initof).
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Diff for: ‎docs/src/content/docs/book/exit-codes.mdx

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[$42$](#42) | [Action phase][a] | Library change action error.
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[$43$](#43) | [Action phase][a] | Exceeded maximum number of cells in the library or the maximum depth of the Merkle tree.
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[$50$](#50) | [Action phase][a] | Account state size exceeded limits.
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[$128$](#128) | Tact compiler ([Compute phase][c]) | Null reference exception. Configurable since Tact 1.6 (not released yet).
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[$128$](#128) | Tact compiler ([Compute phase][c]) | Null reference exception. Configurable since Tact 1.6.
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[$129$](#129) | Tact compiler ([Compute phase][c]) | Invalid serialization prefix.
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[$130$](#130) | Tact compiler ([Compute phase][c]) | Invalid incoming message — there's no receiver for the opcode of the received message.
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[$131$](#131) | Tact compiler ([Compute phase][c]) | Constraints error. Reserved, but never thrown.
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[$134$](#134) | Tact compiler ([Compute phase][c]) | Invalid argument.
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[$135$](#135) | Tact compiler ([Compute phase][c]) | Code of a contract was not found.
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[$136$](#136) | Tact compiler ([Compute phase][c]) | Invalid standard address.
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~~[$137$](#137)~~ | ~~Tact compiler ([Compute phase][c])~~ | ~~Masterchain support is not enabled for this contract.~~ Removed since Tact 1.6 (not released yet)
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~~[$137$](#137)~~ | ~~Tact compiler ([Compute phase][c])~~ | ~~Masterchain support is not enabled for this contract.~~ Removed since Tact 1.6
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:::note
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### 137: Masterchain support is not enabled for this contract {#137}
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Prior to removal, any attempts to point to masterchain (ID $-1$) or otherwise interact with it without enabling masterchain support were throwing an exception with exit code $137$: `Masterchain support is not enabled for this contract`.
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Diff for: ‎docs/src/content/docs/book/expressions.mdx

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<Badge text="Gas-expensive" title="Uses 500 gas units or more" variant="danger" size="medium"/>
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Expression `codeOf{:tact}` returns a [`Cell{:tact}`][cell] with the code of a [contract](/book/contracts):
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Diff for: ‎docs/src/content/docs/book/functions.mdx

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### Explicit resolution of method ID collisions
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Like other functions in TON contracts, getters have their _unique_ associated function selectors, which are $19$-bit signed integer identifiers commonly called _method IDs_.
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Diff for: ‎docs/src/content/docs/book/integers.mdx

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`varuint32{:tact}` | [`VarUInteger 32`][varuint] | $0$ to $2^{248} - 1$ | between $5$ and $253$ bits
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`varint32{:tact}` | `VarInteger 32` | $-2^{247}$ to $2^{247} - 1$ | between $5$ and $253$ bits
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The `varuint16{:tact}` format is equivalent to [`coins{:tact}`](#serialization-varint). Its signed variant, `varint16{:tact}`, has the same memory layout except for the signed `value` field, which allows a different range of values: from $-2^{119}$ to $2^{119} - 1$, including both ends.
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Diff for: ‎docs/src/content/docs/book/maps.mdx

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### Replace values, `.replace()` {#replace}
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### Replace and get old value, `.replaceGet()` {#replaceget}
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// K and V correspond to the key and value types of the given map

Diff for: ‎docs/src/content/docs/book/message-mode.mdx

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$0$ | <Badge text="Since Tact 1.6" variant="tip"/> `SendDefaultMode{:tact}` | Ordinary message (default).
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$128$ | <Badge text="Use with caution" title="Careless use can result in a total balance loss" variant="danger"/> `SendRemainingBalance{:tact}` | Carry **all the remaining balance** of the current smart contract instead of the value originally indicated in the message.
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Diff for: ‎docs/src/content/docs/book/send.mdx

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For cheaper on-chain deployments prefer using the [`deploy(){:tact}`](/ref/core-common#deploy) function instead. It computes the address of the contract based on its initial code and data and efficiently composes the resulting message:
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Diff for: ‎docs/src/content/docs/book/statements.mdx

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## Destructuring assignment
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The destructuring assignment is a concise way to unpack [Structs][s] and [Messages][m] into distinct variables. It mirrors the [instantiation syntax](/book/expressions#instantiation), but instead of creating a new [Struct][s] or [Message][m] it binds every field or some of the fields to their respective variables.
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Diff for: ‎docs/src/content/docs/book/structs-and-messages.mdx

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This is useful for cases where you want to handle certain opcodes of a given smart contract, such as [Jetton standard](https://github.com/ton-blockchain/TEPs/blob/master/text/0074-jettons-standard.md). The short-list of opcodes this contract is able to process is [given here in FunC](https://github.com/ton-blockchain/token-contract/blob/main/ft/op-codes.fc). They serve as an interface to the smart contract.
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<Badge text="Available since Tact 1.6 (not released yet)" variant="tip" size="small"/> A message opcode can be any [compile-time](/ref/core-comptime) expression that evaluates to a positive $32$-bit integer, so the following is also valid:
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<Badge text="Available since Tact 1.6" variant="tip" size="small"/> A message opcode can be any [compile-time](/ref/core-comptime) expression that evaluates to a positive $32$-bit integer, so the following is also valid:
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Diff for: ‎docs/src/content/docs/ref/core-advanced.mdx

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## setGasLimit
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## myCode
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## getSeed
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