Type is not always enforced

[sindresorhus]

From marionebl/svg-term-cli@fe5d2a6#r26544549

Test case:

node test.js --cursor=false

// test.js
const cli = require('meow')(``, {
    flags: {
        cursor: { type: 'boolean' }
    }
});
console.log(typeof cli.flags.cursor); // string

It should output false.