From a40214c96ffa36adaf33581519a1f991e3479ddf Mon Sep 17 00:00:00 2001
From: Ichinose Shogo <shogo82148@gmail.com>
Date: Tue, 28 Jul 2020 06:10:06 +0900
Subject: [PATCH] add a comment about assigning `RawJSON`

---
 ephemeralkey.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ephemeralkey.go b/ephemeralkey.go
index d648faee97..9bc8a7fdcc 100644
--- a/ephemeralkey.go
+++ b/ephemeralkey.go
@@ -46,6 +46,9 @@ func (e *EphemeralKey) UnmarshalJSON(data []byte) error {
 		*e = EphemeralKey(ee)
 	}
 
+	// Go does guarantee the longevity of `data`, so copy when assigning `RawJSON`
+	// See https://golang.org/pkg/encoding/json/#Unmarshaler
+	// and https://github.com/stripe/stripe-go/pull/1142
 	e.RawJSON = append(e.RawJSON[:0], data...)
 
 	return nil