S (note.Note_brr.Consoler.S)

val log : 
  ?obs:bool ->
  ?l:Brr.Console.log ->
  ?v:'a Brr.Console.msgr ->
  string ->
  'a Note.signal ->
  'a Note.signal

signal is like log_value but on the changes of s. If obs is true, the return value is s itself and the tracing occurs through a logger, note that this prevents s from being garbage collected. If obs is false, the return value is s mapped by a tracing identity and using s's equality function.