Fix: JSONBlob

[nytamin]

• What is the current behavior? (You can also link to an open issue here) Wherever we do JSON.stringify and then JSON.parse() we risk bugs, because JSON.parse accepts any.

• What is the new behavior (if this is a feature change)? By using JSONBlob we ensure that typings are kept and it's not as risky to parse strings anymore.

Usage:

interface A {
  a: number
}
const aBlob: JSONBlob<A> = JSONBlobStringify({ a: 1 })
const a: A = JSONBlobParse(aBlob)