Make text format for type_array.go.erb opt-out

Some types, like RECORD, don't have sane text format. If we want to have
arrays of such types, we don't want to generate text format for such arrays
either.

typed_array.go.erb

@@ -4,6 +4,8 @@
   # defaults when not explicitly set on command line
 
   binary_format ||= "true"
+  text_format ||= "true"
+
   text_null ||= "NULL"
 %>
 
@@ -286,6 +288,7 @@ func (src *<%= pgtype_array_type %>) assignToRecursive(value reflect.Value, inde
 	return index, nil
 }
 
+<% if text_format == "true" %>
 func (dst *<%= pgtype_array_type %>) DecodeText(ci *ConnInfo, src []byte) error {
 	if src == nil {
 		*dst = <%= pgtype_array_type %>{Status: Null}
@@ -321,6 +324,7 @@ func (dst *<%= pgtype_array_type %>) DecodeText(ci *ConnInfo, src []byte) error
 
 	return nil
 }
+<% end %>
 
 <% if binary_format == "true" %>
 func (dst *<%= pgtype_array_type %>) DecodeBinary(ci *ConnInfo, src []byte) error {
@@ -366,6 +370,7 @@ func (dst *<%= pgtype_array_type %>) DecodeBinary(ci *ConnInfo, src []byte) erro
 }
 <% end %>
 
+<% if text_format == "true" %>
 func (src <%= pgtype_array_type %>) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
 	switch src.Status {
 	case Null:
@@ -422,6 +427,7 @@ func (src <%= pgtype_array_type %>) EncodeText(ci *ConnInfo, buf []byte) ([]byte
 
 	return buf, nil
 }
+<% end %>
 
 <% if binary_format == "true" %>
 	func (src <%= pgtype_array_type %>) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
@@ -469,6 +475,7 @@ func (src <%= pgtype_array_type %>) EncodeText(ci *ConnInfo, buf []byte) ([]byte
 	}
 <% end %>
 
+<% if text_format == "true" %>
 // Scan implements the database/sql Scanner interface.
 func (dst *<%= pgtype_array_type %>) Scan(src interface{}) error {
 	if src == nil {
@@ -499,3 +506,4 @@ func (src <%= pgtype_array_type %>) Value() (driver.Value, error) {
 
 	return string(buf), nil
 }
+<% end %>