How to use the tiny-decoders.number function in tiny-decoders

optional(string, "default")(undefined);
// $ExpectType string | null
optional(string, null)(undefined);
// $ExpectType string
map(string, string)(undefined);
// $ExpectType string | number
either(string, number)(undefined);
// $ExpectType string | number | boolean | { readonly [key: string]: unknown; }
either(either(boolean, string), either(number, mixedDict))(undefined);
// $ExpectType string
lazy(() => string)(undefined);

// $ExpectError
boolean(undefined, []);
// $ExpectError
number(undefined, []);
// $ExpectError
string(undefined, []);
// $ExpectError
mixedArray(undefined, []);
// $ExpectError
mixedDict(undefined, []);
// $ExpectError
constant("const")(undefined, []);
// $ExpectError
constant("const")(undefined, {});
array(string)(undefined, []);
// $ExpectError
array(string)(undefined, {});
dict(string)(undefined, []);
// $ExpectError
dict(string)(undefined, {});