get_theme_mod: sprintf on $default parameter would (wrongly) strip any '%'

[daviedR]

Hi,

I noticed that the get_theme_mod function use sprintf on the $default parameter, as seen on this line:
https://core.trac.wordpress.org/browser/tags/4.9.5/src/wp-includes/theme.php#L872

Any % character in the $default string would be stripped.

For example:
get_theme_mod( 'my_theme_mod_key', '100%' ); would return '100' as the default value, not '100%'.

[SergeyBiryukov]

Hi @daviedR, welcome to WordPress Trac!

Thanks for the report, we're already tracking this issue in #34290.