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+# go-toml v2
+
+Go library for the [TOML](https://toml.io/en/) format.
+
+This library supports [TOML v1.0.0](https://toml.io/en/v1.0.0).
+
+## Development status
+
+This is the upcoming major version of go-toml. It is currently in active
+development. As of release v2.0.0-beta.1, the library has reached feature parity
+with v1, and fixes a lot known bugs and performance issues along the way.
+
+If you do not need the advanced document editing features of v1, you are
+encouraged to try out this version.
+
+[👉 Roadmap for v2](https://github.com/pelletier/go-toml/discussions/506)
+
+[🐞 Bug Reports](https://github.com/pelletier/go-toml/issues)
+
+[💬 Anything else](https://github.com/pelletier/go-toml/discussions)
+
+## Documentation
+
+Full API, examples, and implementation notes are available in the Go
+documentation.
+
+[![Go Reference](https://pkg.go.dev/badge/github.com/pelletier/go-toml/v2.svg)](https://pkg.go.dev/github.com/pelletier/go-toml/v2)
+
+## Import
+
+```go
+import "github.com/pelletier/go-toml/v2"
+```
+
+See [Modules](#Modules).
+
+## Features
+
+### Stdlib behavior
+
+As much as possible, this library is designed to behave similarly as the
+standard library's `encoding/json`.
+
+### Performance
+
+While go-toml favors usability, it is written with performance in mind. Most
+operations should not be shockingly slow. See [benchmarks](#benchmarks).
+
+### Strict mode
+
+`Decoder` can be set to "strict mode", which makes it error when some parts of
+the TOML document was not prevent in the target structure. This is a great way
+to check for typos. [See example in the documentation][strict].
+
+[strict]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#example-Decoder.DisallowUnknownFields
+
+### Contextualized errors
+
+When most decoding errors occur, go-toml returns [`DecodeError`][decode-err]),
+which contains a human readable contextualized version of the error. For
+example:
+
+```
+2| key1 = "value1"
+3| key2 = "missing2"
+ | ~~~~ missing field
+4| key3 = "missing3"
+5| key4 = "value4"
+```
+
+[decode-err]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#DecodeError
+
+### Local date and time support
+
+TOML supports native [local date/times][ldt]. It allows to represent a given
+date, time, or date-time without relation to a timezone or offset. To support
+this use-case, go-toml provides [`LocalDate`][tld], [`LocalTime`][tlt], and
+[`LocalDateTime`][tldt]. Those types can be transformed to and from `time.Time`,
+making them convenient yet unambiguous structures for their respective TOML
+representation.
+
+[ldt]: https://toml.io/en/v1.0.0#local-date-time
+[tld]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#LocalDate
+[tlt]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#LocalTime
+[tldt]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#LocalDateTime
+
+## Getting started
+
+Given the following struct, let's see how to read it and write it as TOML:
+
+```go
+type MyConfig struct {
+      Version int
+      Name    string
+      Tags    []string
+}
+```
+
+### Unmarshaling
+
+[`Unmarshal`][unmarshal] reads a TOML document and fills a Go structure with its
+content. For example:
+
+```go
+doc := `
+version = 2
+name = "go-toml"
+tags = ["go", "toml"]
+`
+
+var cfg MyConfig
+err := toml.Unmarshal([]byte(doc), &cfg)
+if err != nil {
+      panic(err)
+}
+fmt.Println("version:", cfg.Version)
+fmt.Println("name:", cfg.Name)
+fmt.Println("tags:", cfg.Tags)
+
+// Output:
+// version: 2
+// name: go-toml
+// tags: [go toml]
+```
+
+[unmarshal]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#Unmarshal
+
+### Marshaling
+
+[`Marshal`][marshal] is the opposite of Unmarshal: it represents a Go structure
+as a TOML document:
+
+```go
+cfg := MyConfig{
+      Version: 2,
+      Name:    "go-toml",
+      Tags:    []string{"go", "toml"},
+}
+
+b, err := toml.Marshal(cfg)
+if err != nil {
+      panic(err)
+}
+fmt.Println(string(b))
+
+// Output:
+// Version = 2
+// Name = 'go-toml'
+// Tags = ['go', 'toml']
+```
+
+[marshal]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#Marshal
+
+## Benchmarks
+
+Execution time speedup compared to other Go TOML libraries:
+
+<table>
+    <thead>
+        <tr><th>Benchmark</th><th>go-toml v1</th><th>BurntSushi/toml</th></tr>
+    </thead>
+    <tbody>
+        <tr><td>Marshal/HugoFrontMatter-2</td><td>1.9x</td><td>1.9x</td></tr>
+        <tr><td>Marshal/ReferenceFile/map-2</td><td>1.7x</td><td>1.8x</td></tr>
+        <tr><td>Marshal/ReferenceFile/struct-2</td><td>2.2x</td><td>2.5x</td></tr>
+        <tr><td>Unmarshal/HugoFrontMatter-2</td><td>2.9x</td><td>2.9x</td></tr>
+        <tr><td>Unmarshal/ReferenceFile/map-2</td><td>2.6x</td><td>2.9x</td></tr>
+        <tr><td>Unmarshal/ReferenceFile/struct-2</td><td>4.4x</td><td>5.3x</td></tr>
+     </tbody>
+</table>
+<details><summary>See more</summary>
+<p>The table above has the results of the most common use-cases. The table below
+contains the results of all benchmarks, including unrealistic ones. It is
+provided for completeness.</p>
+
+<table>
+    <thead>
+        <tr><th>Benchmark</th><th>go-toml v1</th><th>BurntSushi/toml</th></tr>
+    </thead>
+    <tbody>
+        <tr><td>Marshal/SimpleDocument/map-2</td><td>1.8x</td><td>2.9x</td></tr>
+        <tr><td>Marshal/SimpleDocument/struct-2</td><td>2.7x</td><td>4.2x</td></tr>
+        <tr><td>Unmarshal/SimpleDocument/map-2</td><td>4.5x</td><td>3.1x</td></tr>
+        <tr><td>Unmarshal/SimpleDocument/struct-2</td><td>6.2x</td><td>3.9x</td></tr>
+        <tr><td>UnmarshalDataset/example-2</td><td>3.1x</td><td>3.5x</td></tr>
+        <tr><td>UnmarshalDataset/code-2</td><td>2.3x</td><td>3.1x</td></tr>
+        <tr><td>UnmarshalDataset/twitter-2</td><td>2.5x</td><td>2.6x</td></tr>
+        <tr><td>UnmarshalDataset/citm_catalog-2</td><td>2.1x</td><td>2.2x</td></tr>
+        <tr><td>UnmarshalDataset/canada-2</td><td>1.6x</td><td>1.3x</td></tr>
+        <tr><td>UnmarshalDataset/config-2</td><td>4.3x</td><td>3.2x</td></tr>
+        <tr><td>[Geo mean]</td><td>2.7x</td><td>2.8x</td></tr>
+     </tbody>
+</table>
+<p>This table can be generated with <code>./ci.sh benchmark -a -html</code>.</p>
+</details>
+
+## Modules
+
+go-toml uses Go's standard modules system.
+
+Installation instructions:
+
+- Go ≥ 1.16: Nothing to do. Use the import in your code. The `go` command deals
+  with it automatically.
+- Go ≥ 1.13: `GO111MODULE=on go get github.com/pelletier/go-toml/v2`.
+
+In case of trouble: [Go Modules FAQ][mod-faq].
+
+[mod-faq]: https://github.com/golang/go/wiki/Modules#why-does-installing-a-tool-via-go-get-fail-with-error-cannot-find-main-module
+
+## Tools
+
+Go-toml provides three handy command line tools:
+
+ * `tomljson`: Reads a TOML file and outputs its JSON representation.
+
+    ```
+    $ go install github.com/pelletier/go-toml/v2/cmd/tomljson@latest
+    $ tomljson --help
+    ```
+
+ * `jsontoml`: Reads a JSON file and outputs a TOML representation.
+
+    ```
+    $ go install github.com/pelletier/go-toml/v2/cmd/jsontoml@latest
+    $ jsontoml --help
+    ```
+
+ * `tomll`: Lints and reformats a TOML file.
+
+    ```
+    $ go install github.com/pelletier/go-toml/v2/cmd/tomll@latest
+    $ tomll --help
+    ```
+
+### Docker image
+
+Those tools are also available as a [Docker image][docker]. For example, to use
+`tomljson`:
+
+```
+docker run -i ghcr.io/pelletier/go-toml:v2 tomljson < example.toml
+```
+
+Multiple versions are availble on [ghcr.io][docker].
+
+[docker]: https://github.com/pelletier/go-toml/pkgs/container/go-toml
+
+## Migrating from v1
+
+This section describes the differences between v1 and v2, with some pointers on
+how to get the original behavior when possible.
+
+### Decoding / Unmarshal
+
+#### Automatic field name guessing
+
+When unmarshaling to a struct, if a key in the TOML document does not exactly
+match the name of a struct field or any of the `toml`-tagged field, v1 tries
+multiple variations of the key ([code][v1-keys]).
+
+V2 instead does a case-insensitive matching, like `encoding/json`.
+
+This could impact you if you are relying on casing to differentiate two fields,
+and one of them is a not using the `toml` struct tag. The recommended solution
+is to be specific about tag names for those fields using the `toml` struct tag.
+
+[v1-keys]: https://github.com/pelletier/go-toml/blob/a2e52561804c6cd9392ebf0048ca64fe4af67a43/marshal.go#L775-L781
+
+#### Ignore preexisting value in interface
+
+When decoding into a non-nil `interface{}`, go-toml v1 uses the type of the
+element in the interface to decode the object. For example:
+
+```go
+type inner struct {
+  B interface{}
+}
+type doc struct {
+  A interface{}
+}
+
+d := doc{
+  A: inner{
+    B: "Before",
+  },
+}
+
+data := `
+[A]
+B = "After"
+`
+
+toml.Unmarshal([]byte(data), &d)
+fmt.Printf("toml v1: %#v\n", d)
+
+// toml v1: main.doc{A:main.inner{B:"After"}}
+```
+
+In this case, field `A` is of type `interface{}`, containing a `inner` struct.
+V1 sees that type and uses it when decoding the object.
+
+When decoding an object into an `interface{}`, V2 instead disregards whatever
+value the `interface{}` may contain and replaces it with a
+`map[string]interface{}`. With the same data structure as above, here is what
+the result looks like:
+
+```go
+toml.Unmarshal([]byte(data), &d)
+fmt.Printf("toml v2: %#v\n", d)
+
+// toml v2: main.doc{A:map[string]interface {}{"B":"After"}}
+```
+
+This is to match `encoding/json`'s behavior. There is no way to make the v2
+decoder behave like v1.
+
+#### Values out of array bounds ignored
+
+When decoding into an array, v1 returns an error when the number of elements
+contained in the doc is superior to the capacity of the array. For example:
+
+```go
+type doc struct {
+  A [2]string
+}
+d := doc{}
+err := toml.Unmarshal([]byte(`A = ["one", "two", "many"]`), &d)
+fmt.Println(err)
+
+// (1, 1): unmarshal: TOML array length (3) exceeds destination array length (2)
+```
+
+In the same situation, v2 ignores the last value:
+
+```go
+err := toml.Unmarshal([]byte(`A = ["one", "two", "many"]`), &d)
+fmt.Println("err:", err, "d:", d)
+// err: <nil> d: {[one two]}
+```
+
+This is to match `encoding/json`'s behavior. There is no way to make the v2
+decoder behave like v1.
+
+#### Support for `toml.Unmarshaler` has been dropped
+
+This method was not widely used, poorly defined, and added a lot of complexity.
+A similar effect can be achieved by implementing the `encoding.TextUnmarshaler`
+interface and use strings.
+
+#### Support for `default` struct tag has been dropped
+
+This feature adds complexity and a poorly defined API for an effect that can be
+accomplished outside of the library.
+
+It does not seem like other format parsers in Go support that feature (the
+project referenced in the original ticket #202 has not been updated since 2017).
+Given that go-toml v2 should not touch values not in the document, the same
+effect can be achieved by pre-filling the struct with defaults (libraries like
+[go-defaults][go-defaults] can help). Also, string representation is not well
+defined for all types: it creates issues like #278.
+
+The recommended replacement is pre-filling the struct before unmarshaling.
+
+[go-defaults]: https://github.com/mcuadros/go-defaults
+
+#### `toml.Tree` replacement
+
+This structure was the initial attempt at providing a document model for
+go-toml. It allows manipulating the structure of any document, encoding and
+decoding from their TOML representation. While a more robust feature was
+initially planned in go-toml v2, this has been ultimately [removed from
+scope][nodoc] of this library, with no plan to add it back at the moment. The
+closest equivalent at the moment would be to unmarshal into an `interface{}` and
+use type assertions and/or reflection to manipulate the arbitrary
+structure. However this would fall short of providing all of the TOML features
+such as adding comments and be specific about whitespace.
+
+
+#### `toml.Position` are not retrievable anymore
+
+The API for retrieving the position (line, column) of a specific TOML element do
+not exist anymore. This was done to minimize the amount of concepts introduced
+by the library (query path), and avoid the performance hit related to storing
+positions in the absence of a document model, for a feature that seemed to have
+little use. Errors however have gained more detailed position
+information. Position retrieval seems better fitted for a document model, which
+has been [removed from the scope][nodoc] of go-toml v2 at the moment.
+
+### Encoding / Marshal
+
+#### Default struct fields order
+
+V1 emits struct fields order alphabetically by default. V2 struct fields are
+emitted in order they are defined. For example:
+
+```go
+type S struct {
+	B string
+	A string
+}
+
+data := S{
+	B: "B",
+	A: "A",
+}
+
+b, _ := tomlv1.Marshal(data)
+fmt.Println("v1:\n" + string(b))
+
+b, _ = tomlv2.Marshal(data)
+fmt.Println("v2:\n" + string(b))
+
+// Output:
+// v1:
+// A = "A"
+// B = "B"
+
+// v2:
+// B = 'B'
+// A = 'A'
+```
+
+There is no way to make v2 encoder behave like v1. A workaround could be to
+manually sort the fields alphabetically in the struct definition, or generate
+struct types using `reflect.StructOf`.
+
+#### No indentation by default
+
+V1 automatically indents content of tables by default. V2 does not. However the
+same behavior can be obtained using [`Encoder.SetIndentTables`][sit]. For example:
+
+```go
+data := map[string]interface{}{
+	"table": map[string]string{
+		"key": "value",
+	},
+}
+
+b, _ := tomlv1.Marshal(data)
+fmt.Println("v1:\n" + string(b))
+
+b, _ = tomlv2.Marshal(data)
+fmt.Println("v2:\n" + string(b))
+
+buf := bytes.Buffer{}
+enc := tomlv2.NewEncoder(&buf)
+enc.SetIndentTables(true)
+enc.Encode(data)
+fmt.Println("v2 Encoder:\n" + string(buf.Bytes()))
+
+// Output:
+// v1:
+//
+// [table]
+//   key = "value"
+//
+// v2:
+// [table]
+// key = 'value'
+//
+//
+// v2 Encoder:
+// [table]
+//   key = 'value'
+```
+
+[sit]: https://pkg.go.dev/github.com/pelletier/go-toml/v2#Encoder.SetIndentTables
+
+#### Keys and strings are single quoted
+
+V1 always uses double quotes (`"`) around strings and keys that cannot be
+represented bare (unquoted). V2 uses single quotes instead by default (`'`),
+unless a character cannot be represented, then falls back to double quotes. As a
+result of this change, `Encoder.QuoteMapKeys` has been removed, as it is not
+useful anymore.
+
+There is no way to make v2 encoder behave like v1.
+
+#### `TextMarshaler` emits as a string, not TOML
+
+Types that implement [`encoding.TextMarshaler`][tm] can emit arbitrary TOML in
+v1. The encoder would append the result to the output directly. In v2 the result
+is wrapped in a string. As a result, this interface cannot be implemented by the
+root object.
+
+There is no way to make v2 encoder behave like v1.
+
+[tm]: https://golang.org/pkg/encoding/#TextMarshaler
+
+#### `Encoder.CompactComments` has been removed
+
+Emitting compact comments is now the default behavior of go-toml. This option
+is not necessary anymore.
+
+#### Struct tags have been merged
+
+V1 used to provide multiple struct tags: `comment`, `commented`, `multiline`,
+`toml`, and `omitempty`. To behave more like the standard library, v2 has merged
+`toml`, `multiline`, and `omitempty`. For example:
+
+```go
+type doc struct {
+	// v1
+	F string `toml:"field" multiline:"true" omitempty:"true"`
+	// v2
+	F string `toml:"field,multiline,omitempty"`
+}
+```
+
+Has a result, the `Encoder.SetTag*` methods have been removed, as there is just
+one tag now.
+
+
+#### `commented` tag has been removed
+
+There is no replacement for the `commented` tag. This feature would be better
+suited in a proper document model for go-toml v2, which has been [cut from
+scope][nodoc] at the moment.
+
+#### `Encoder.ArraysWithOneElementPerLine` has been renamed
+
+The new name is `Encoder.SetArraysMultiline`. The behavior should be the same.
+
+#### `Encoder.Indentation` has been renamed
+
+The new name is `Encoder.SetIndentSymbol`. The behavior should be the same.
+
+
+#### Embedded structs behave like stdlib
+
+V1 defaults to merging embedded struct fields into the embedding struct. This
+behavior was unexpected because it does not follow the standard library. To
+avoid breaking backward compatibility, the `Encoder.PromoteAnonymous` method was
+added to make the encoder behave correctly. Given backward compatibility is not
+a problem anymore, v2 does the right thing by default: it follows the behavior
+of `encoding/json`. `Encoder.PromoteAnonymous` has been removed.
+
+[nodoc]: https://github.com/pelletier/go-toml/discussions/506#discussioncomment-1526038
+
+### `query`
+
+go-toml v1 provided the [`go-toml/query`][query] package. It allowed to run
+JSONPath-style queries on TOML files. This feature is not available in v2. For a
+replacement, check out [dasel][dasel].
+
+This package has been removed because it was essentially not supported anymore
+(last commit May 2020), increased the complexity of the code base, and more
+complete solutions exist out there.
+
+[query]: https://github.com/pelletier/go-toml/tree/f99d6bbca119636aeafcf351ee52b3d202782627/query
+[dasel]: https://github.com/TomWright/dasel
+
+## License
+
+The MIT License (MIT). Read [LICENSE](LICENSE).