Possible API changes

[hellemo]

Things to test/discuss:

• Use types for safe/unsafe inserts (e.g. UnsafeVarArray) without bounds checks and dispatch for safe/unsafe insertvar
• Use types for dynamic/static index names? Possibly parametric types (Dynamic/Static, Safe/Unsafe)
• Alternatively, would it be possible to support @inbounds for safe/unsafe insert/getindex?

[hellemo]

Alternatively use a parameter for safe/unsafe, to facilitate switch between safe and unsafe. Default to safe to use during development, but be able to easily switch to unsafe for performance in some cases. I guess adding a unsafe option to the normal insertvar! would be non-breaking as long as it defaults to safe.

[trulsf]

Little experience with @inbounds, but I think a parameter for safe/unsafe is a good place to start.