Function items

Creates a pipe from a data source.

Data sources are handled as follows:

• undefined - filtered out and not yielded
• Primitives (strings, numbers, booleans, null): Treated as atomic values and yielded as single items
• Arrays/Iterables (excluding strings): Items are yielded individually (with undefined items filtered out)
• Async Iterables/Pipes: Items are yielded as they become available (with undefined items filtered out)
• Promises: Awaited and then processed according to their resolved value
• Other values (objects, etc.): Yielded as single items

The feed parameter can be synchronous or asynchronous (returning a Promise). Async feeds are useful for fetching data from APIs, databases, or any async source.

Creates a pipe from multiple scalar values.