IxJS version:
4.3.1

Code to reproduce:
`const {of, first} = require('ix/asynciterable')
const {timeout} = require('ix/asynciterable/operators')

async function main()
{
const value = await first(of(42).pipe(timeout(100)))
console.log(value)
}

main()`

Expected behavior:
output '42' to the console

Actual behavior:
outputs 'undefined' to the console

Additional information:
commit b0c90cb introduced this bug by renaming 'value' to 'val' in src/asynciterable/operators/timeout.ts at line 57