Release 2.1.6

The following features and bug fixes were provided for the Dogelog player of version 2.1.6:

Language Reference

• New evaluable function nan/1 in the core introduced.
• New literal syntax 0rNaN in the core introduced.
• New plot option render/1 and decor/1 in library(plot) introduced.
  
• New plot option xaxis/1 and yaxis/1 in library(plot) introduced.
• The report option multi/1 has been removed from library(report).
  
• New report option legend/1 in library(report) introduced.
• The Prolog flag version_data has been removed.
• The predicate reference/1 has been removed from the core.
• The predicate same_term/2 has been removed from the core.
• The predicate hash_code/2 has been removed from the core.
• The predicate term_hash/2 has been removed from library(compat).
• New predicate term_hash/2 in core introduced.

Host Interface

• The frozen terms have now their hash code precomputed.
• The frozen terms are now not anymore copied during assert.
• The predicate term_hash/2 now fast paths frozen terms.
• The predicate term_hash/2 now associates via functor swizzling.
• The predicate nonvar/1 is now skipped in body indexing.
• The runtime Prolog text loader now understands clumps.
• The JavaScript, Python and Java transpilers now understand clumps.
• The main clause rope is now an input order hash set.
• The predicate make/0 now treats system files as non-reloadable.