Release 1.2.5

The following features and bug fixes were provided for the Dogelog player of version 1.2.5:

Language Reference

The predicate term_variables/3 has been removed.
New predicate unnumbervars/2 introduced in library(compat).
New library(util/tree) introduced.
New predicate dict_size/2 introduced in library(misc/dict).
New predicate unnumbervars/3 introduced in library(compat).
The predicate aggregate/3 now only uses O(k) space.
The predicates bagof/3 and setof/3 now bootstrapped from aggregate/3.
New library(tools) introduced.
The predicate term_singletons/2 moved to library(compat).
The predicate nonground/2 moved to library(compat).

Host Interface

Check JavaScript operating system errors with falsy (!err).
Access some current_prolog_flag/2 via a host dictionary.

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