Replace cases of {} being used to store arbitrary names with Object.create(null)

[ssalbdivad]

I just found a bug with this code:

const nameCounts: Record<string, number | undefined> = {};

export const register = (value: object | symbol): string => {
  const existingName = namesByResolution.get(value);
  if (existingName) return existingName;

  let name = baseNameFor(value);
  if (nameCounts[name]) name = `${name}${nameCounts[name]!++}`;
  else nameCounts[name] = 1;

  registry[name] = value;
  namesByResolution.set(value, name);
  return name;
};

Where attempting to register a function called toString results in a registered name of toStringNaN☠️

We frequently use objects like this to keep track of cached entries. Many of them don't overlap with object method names like toString, but we should review those we have and switch them to Object.create(null) and implement a lint rule if possible.