I'm confused about properties. Is there precise documentation about how 
different ways of declaring properties affects the created elements?

If I have this properties block:

properties: {
  string1: String,

  string2: {
    type: String
  },

  string3:{
    type: String,
    value: ''
  },

  string4: {
    type: String,
    reflectToAttribute: true,
  },

  string5: {
    type: String,
    value: '',
    reflectToAttribute: true
  }
}

It seems an instance of my element will only have one attribute: 
<element string5="">.

Furthermore:
element.hasOwnProperty('string1') === false;
element.hasOwnProperty('string2') === false;
element.hasOwnProperty('string3') === true; element.string3 === '';
element.hasOwnProperty('string4') === true; element.string4 === undefined;
element.hasOwnProperty('string5') === true; element.string5 === '';

The behavior of element.string4 is particularly baffling.

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