"allow-config-dups" allow to replace some objects. As I understand
log objects cann't have identifier and cann't be replaced therefore.
Is it true or I wrong? It would be nice to be able to replace log
object also.
That is correct. You can think of a "log" block as an operation (not really an object) that links objects together, creating a path (a directed acyclic graph). They have no identifiers though.
Could you share your use case, where you wanted to "replace" log blocks?
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László Várady