Where in WordPress core is the method or function that reads the style CSS header?

See this line in the WP_Theme class constructor:

https://github.com/WordPress/wordpress-develop/blob/6.5/src/wp-includes/class-wp-theme.php#L348

that calls the get_file_data() function:

https://developer.wordpress.org/reference/functions/get_file_data/

on the style.css file.

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