When installing plugins/ update WP: json_encode() recursion detected in update.php on lines 261 and 405

[RTalal]

When installing plugins (from wp interface), they are installed fine, but give warning. Example:

Installing Plugin: WordPress Importer 0.6.1
Successfully installed the plugin WordPress Importer 0.6.1.
Warning: json_encode() [function.json-encode]: recursion detected in /home/USER/public_html/test/wp-includes/update.php on line 261
Warning: json_encode() [function.json-encode]: recursion detected in /home/USER/public_html/test/wp-includes/update.php on line 405

In my installation (3.9-beta3-27857), line 261 in 3.9-beta3-27857:

	$url = set_url_scheme( $url, 'https' );

Line 405:

        $raw_response = wp_remote_post( $http_url, $options );

Maybe something has to do with ssl? I was logging in on ssl (https) (self-signed, if this matters).
I logged out and re-logged in with plain (http), but the same warnings appeared.

When updating wordpress, I get the same error. As it does not stay for long, I took a screenshot for it.

There is a similar warning for those same php lines in:
#27633 closed enhancement (fixed) , which is about UPRADING plugins or themes.

Notes:
Server:PHP 5.2.17, MySQL 5.5.36, Memory Usage 37,193,072 bytes

Site is right-to-left enabled, Arabic language enabled in wp-config.php, but wp language file is not uploaded.

[dd32]

Duplicate of #27633.

This has already been fixed, but that fix isn't in the current nightly.
Should be right tomorrow.

[RTalal]

warning when upgradimg wp