Why is my Blog Page ID == First Post ID?

the ‘posts page’ ID when using a static front page and a different posts page is:

get_option( 'page_for_posts' )

in some context:

if( is_home() && get_option( 'page_for_posts' ) ) { 
  $page_ID = get_option( 'page_for_posts' ); 
}

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