I noticed that evaluation inside square braces and $eval() belonging to %var.bf is being done in doubles mode if it's the simple 'var/set math' but does get the .bf mode result if the math has 3 terms.
This has always been the case. If you use /set or /var without a calculation, it is assigned as text.
As for using different combinations of identifiers, parameters, [] brackets, and so on - I have purposefully not changed the parser in any way to accomodate bigfloat. The only way it can be enabled is by using the /bigfloat command or when the parser, during its normal evaluation process, comes across a %var.bf. The evaluation process/order cannot be changed in any way as that would break all existing scripts.
