Use decoder with json.Number support

Signed-off-by: Peter Broadhurst <peter.broadhurst@kaleido.io>

Author: peterbroadhurst

pkg/abi/abi.go

@@ -394,7 +394,9 @@ func (pa ParameterArray) ParseJSON(data []byte) (*ComponentValue, error) {
 
 func (pa ParameterArray) ParseJSONCtx(ctx context.Context, data []byte) (*ComponentValue, error) {
 	var jsonTree interface{}
-	err := json.Unmarshal(data, &jsonTree)
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.UseNumber()
+	err := decoder.Decode(&jsonTree)
 	if err != nil {
 		return nil, err
 	}

pkg/abi/abi_test.go

@@ -685,7 +685,7 @@ func TestParseJSONArrayLotsOfTypes(t *testing.T) {
 func TestParseJSONBadData(t *testing.T) {
 	inputs := testABI(t, sampleABI1)[0].Inputs
 	_, err := inputs.ParseJSON([]byte(`{`))
-	assert.Regexp(t, "unexpected end", err)
+	assert.Regexp(t, "unexpected EOF", err)
 
 }