➕sloppy equality (==)

// ⭐️ sloppy equality (==)
null == undefined,  // true
0    == '0',        // true    ('0'   -> 0)
0    == false,      // true    (false -> 0)
1    == true,       // true    (true  -> 1)
'1'  == true,       // true    (true  -> 1, then '1' -> 1)
'0'  == false,      // true    (false -> 0, then '0' -> 0)

// ⭐️ convertibility doesn't imply equality
//   (undefined can be converted to false)
undefined == false, // false❗