Support suppressHydrationWarning for element-ish text

[rickhanlonii]

This would allow setting suppressHydrationWarning on element-ish text nodes:

const obj = {
  $$typeof: Symbol.for('react.element'),
  type: props => props.content,
  ref: null,
  key: null,
  props: {
    suppressHydrationWarning: true,
    content: isClient ? 'Client Text' : 'Server Text',
  },
  toString() {
    return this.props.content;
  },
};

[sebmarkbage]

This isn't rebased and it doesn't cover all cases but I think since this is basically just the same as enabling it everywhere, this is probably safer/easier: #28655

[rickhanlonii]

Yeah your PR is better