From 57bfb058d5f7c92a56dd8910400a1815e27245fb Mon Sep 17 00:00:00 2001
From: Saj Goonatilleke <sg@redu.cx>
Date: Thu, 18 Mar 2021 00:30:42 +1100
Subject: [PATCH] mapper: correct text/binary typo

Fixes a panic when attempting to make use of pointers to types that
implement encoding.BinaryUnmarshaler.  e.g.:

    type SomeBinaryFlag struct{}

    func (f *SomeBinaryFlag) UnmarshalBinary(data []byte) error {
	    // ...
	    return nil
    }

    var cli struct {
	    Binary *SomeBinaryFlag
    }
---
 mapper.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mapper.go b/mapper.go
index 7eb77fb..b8447ec 100644
--- a/mapper.go
+++ b/mapper.go
@@ -84,7 +84,7 @@ func (m *binaryUnmarshalerAdapter) Decode(ctx *DecodeContext, target reflect.Val
 	if err != nil {
 		return err
 	}
-	if target.Type().Implements(textUnmarshalerType) {
+	if target.Type().Implements(binaryUnmarshalerType) {
 		return target.Interface().(encoding.BinaryUnmarshaler).UnmarshalBinary([]byte(value))
 	}
 	return target.Addr().Interface().(encoding.BinaryUnmarshaler).UnmarshalBinary([]byte(value))