Eager vs. Lazy PRNG Draws: Why Persona Generation Order Matters for Stability

In the Munchausen data-generation library, a core design question is whether a persona bundle—comprising linked fields like name and email—should draw from the random stream eagerly at object construction or lazily when each member is first accessed. Under the lazy approach, reordering or adding fields shifts every value in the stream, silently breaking deterministic output even when the seed is unchanged. The eager strategy draws the entire persona block upfront as a fixed unit, making member order irrelevant and keeping values stable across routine model edits. The author chose eager generation as the default, accepting that persona fields no longer draw at their individual positions in member order—a deliberate trade-off for reorder invariance. One documented exception exists: directly accessing the persona via the explicit accessor on an object that never activated a persona still triggers a lazy, order-dependent draw.