Entity attribute ennumeration one indexed internally and zero indexed externally

[no-lex]

The engine ennumerates its five attributes starting at one (e.attr1 e.attr2 e.attr3 e.attr4 e.attr5) but other parts of the engine (including even the entattr command to edit it) are zero-indexed.

This means that entattr 1 1 sets entity attribute e.attr2 to 1, for example.