bug in debug mode

[erfanium]

const v = new V({ debug:true })
const schema = { x: "string" }
const check = v.compile(schema)

output:

SyntaxError: Unexpected token (2:10)
  1 | // Context.fn[0]
> 2 | function () { [native code] }

output without prettier:

// Context.fn[0]
function () { [native code] }
// Context.fn[1]
function () { [native code] }

...

Because Function.prototype.bind is native code.
Related #231

[erfanium]

Possible solutions:

1. Using Function.prototype.call instead of bind
2. Store function source code as string in context for debug