code: func (store *StoreComposer) Capabilities() string {
  	str := "Core: "
  
  	if store.Core != nil {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  
  	str += ` Terminater: `
  	if store.UsesTerminater {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  	str += ` Finisher: `
  	if store.UsesFinisher {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  	str += ` Locker: `
  	if store.UsesLocker {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  	str += ` GetReader: `
  	if store.UsesGetReader {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  	str += ` Concater: `
  	if store.UsesConcater {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  	str += ` LengthDeferrer: `
  	if store.UsesLengthDeferrer {
  		str += "✓"
  	} else {
  		str += "✗"
  	}
  
  	return str
  }
docs: // Capabilities returns a string representing the provided extensions in a
  // human-readable format meant for debugging.