--- (3) ---
true
true
false
true

 --- (2) ---
true
false

 --- (3) ---
{ text: 'How goes?', from: 'John' }
{ text: 'Spill the tea!!', from: 'Mark' }
{ text: 'Hahahah', from: 'Anne' }

 --- (4) ---
WeakMap { <items unknown> }
azerty
undefined
undefined
true
true
false
true
false

 --- (4) ---
true
false
true