Adapter::is_sql_method_call() – Detect whether or not the string represents a function call and if so do not wrap it in single-quotes, otherwise do wrap in single quotes.
Admin_Columns_Cache_Integration::maybe_fill_cache() – Makes sure we calculate all values in one query by filling our cache beforehand.
Current_Page_Helper::is_multiple_terms_page() – Determine whether this page is an taxonomy archive page for multiple terms (url: /term-1,term2/).
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