All classes that implement PlaceholderStrategyInterface in Drupal 8

class \Drupal\Core\Render\Placeholder\ChainedPlaceholderStrategy implements PlaceholderStrategyInterface
class \Drupal\Core\Render\Placeholder\SingleFlushStrategy implements PlaceholderStrategyInterface
class \Drupal\big_pipe\Render\Placeholder\BigPipeStrategy implements PlaceholderStrategyInterface
class \Drupal\big_pipe_sessionless\Render\Placeholder\BigPipeSessionlessStrategy

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