var._extractDecimal

• Convert the stored value to type T.
• Conversion rules:
• - If the current type is Type.NULL, this returns T.init.
• - Scalars and strings convert via std.conv.to.
• - If the current type is Type.ARRAY and T is var[],
• a copy of the underlying array is returned (each element is a deep
• copy, so nested containers and native buffers are not aliased). If T
• is string, this returns the textual representation from toString().
• - If the current type is Type.OBJECT (map) and T is var[string],
• an independent copy of the underlying map is returned, with every
• value deep-copied through the same qualified-copy path as dup. If
• T is string, this returns the textual representation from
• toString().
• - For other combinations, behavior is currently T.init.

  Throws

  VarTypeException if T is one of the datetime types (Date,
• TimeOfDay, DateTime, SysTime, Duration) and the stored type
• does not match exactly. Prepare a FixedDecimal extraction target from the stored decimal.

Shared by as and tryAs. Exact-capacity copies are cheap; cross-capacity conversions are checked; fixed-scale targets are produced by checked atScale rescaling, and the contract is final- target representability: wide values rescale in wide capacity first and narrow afterwards. Wide runtime-scale targets widen before any fixed scale applies.