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// Flatten makes flat, one-dimensional maps from arbitrarily nested ones.
//
// It turns map keys into compound
// names, in four default styles: dotted (`a.b.1.c`), path-like (`a/b/1/c`), Rails (`a[b][1][c]`),
// or with underscores (`a_b_1_c`). Alternatively, you can pass a custom style.
//
// It takes input as either JSON strings or
// Go structures. It knows how to traverse these JSON types: objects/maps, arrays and scalars.
//
// You can flatten JSON strings.
//
// nested := `{
// "one": {
// "two": [
// "2a",
// "2b"
// ]
// },
// "side": "value"
// }`
//
// flat, err := flatten.FlattenString(nested, "", flatten.DotStyle)
//
// // output: `{ "one.two.0": "2a", "one.two.1": "2b", "side": "value" }`
//
// Or Go maps directly.
//
// nested := map[string]interface{}{
// "a": "b",
// "c": map[string]interface{}{
// "d": "e",
// "f": "g",
// },
// "z": 1.4567,
// }
//
// flat, err := flatten.Flatten(nested, "", flatten.RailsStyle)
//
// // output:
// // map[string]interface{}{
// // "a": "b",
// // "c[d]": "e",
// // "c[f]": "g",
// // "z": 1.4567,
// // }
//
// Let's try a custom style, with the first example above.
//
// emdash := flatten.SeparatorStyle{Middle: "--"}
// flat, err := flatten.FlattenString(nested, "", emdash)
//
// // output: `{ "one--two--0": "2a", "one--two--1": "2b", "side": "value" }`
//
package flatten
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