false, true and null case collision with phpcs

phpcs using Drupal coding standards require for FALSE, TRUE and NULL to be uppercase but prettier formats them to lowercase.
phpcs error message: TRUE, FALSE and NULL must be uppercase; expected "FALSE" but found "false"

prettier@2.0.5

prettier/plugin-php@0.14.3

Input:

  $vars = [
    'account' => $account,
    'manage_access' => FALSE,
  ];

Output:

  $vars = [
    'account' => $account,
    'manage_access' => false,
  ];

Expected behavior:

  $vars = [
    'account' => $account,
    'manage_access' => FALSE,
  ];

Prettier output:

["INFO" - 9:51:20 AM] Detected local configuration (i.e. .prettierrc or .editorconfig), VS Code configuration will not be used
["INFO" - 9:51:20 AM] Using config file at '.../.prettierrc'
["INFO" - 9:51:20 AM] Prettier Options:
{
  "filepath": "...",
  "parser": "php",
  "useTabs": false,
  "tabWidth": 2,
  "endOfLine": "lf",
  "braceStyle": "1tbs",
}
["INFO" - 9:51:20 AM] Formatting completed in 238.064488ms.

Reproduce the issue with the provided PHP input using prettier@2.0.5 and prettier/plugin-php@0.14.3, then inspect the formatter path that handles FALSE, TRUE, and NULL. Done means formatting preserves the uppercase literals required by Drupal coding standards without producing the reported phpcs error.