Word "constructor" should not trigger auto list

[JiuqingSong]

To repro:

1. type "constructor"
2. type SPACE
   Expect: nothing special happens
   Actual: it converts "constructor" into a list with text "function Object() { [native code] } "

This is because we have code like this:

const map = {
  key: value
};

const value =map[input];

If input is some predefined property name such as "constructor", "valueOf", "toString", it will return a function object which is treated as a valid result, which should not.

Fix: use Map instead of Record here.
Future work: Check all other places where Record is used. Possibly find a eslint rule to disable it at all.