Evaluates a function that returns a pattern and embeds it in a stream. In difference to Plazy, the function is evaluated using the environment passed in by the stream.
A Function that returns a pattern or any other valid pattern input.
For more about the composition operator
<> see: Pchain.
Some parameters, like duration, cannot be used in the form of an array in the Pbind. For full parallel expansion see PlazyEnvirN.