:title
Start an output buffer

:sig
function ob_start(request : capture dval)

:returns
This function returns no value.

:params
request : the caller's request, captured when omitted

:content
`ob_start()` starts an output buffer for the active request.

Output after this call goes to the buffer. Use `ob_get`, `ob_get_close`, or `ob_close` to read or close it.

:example capy render
ob_start()
print("fragment")
var captured := ob_get_close()
print("captured: ", captured, "\n")

:see-group
output

:see
type/request
