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encoding/json: document and test overwrite of slice, map during Unmarshal

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Fixes #8837.

Change-Id: Iaaecbb0b324004cb74b16b764126b01315e6a16e
Reviewed-on: https://go-review.googlesource.com/12209
Reviewed-by: Andrew Gerrand <adg@golang.org>
This commit is contained in:
Russ Cox 2015-07-14 21:32:47 -04:00
parent 2d25318f08
commit 749b391c55
2 changed files with 16 additions and 0 deletions
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7
src/encoding/json/decode.go
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@ -48,6 +48,13 @@ import (
// map[string]interface{}, for JSON objects
// nil for JSON null
//
// To unmarshal a JSON array into a slice, Unmarshal resets the slice to nil
// and then appends each element to the slice.
//
// To unmarshal a JSON object into a map, Unmarshal replaces the map
// with an empty map and then adds key-value pairs from the object to
// the map.
//
// If a JSON value is not appropriate for a given target type,
// or if a JSON number overflows the target type, Unmarshal
// skips that field and completes the unmarshalling as best it can.