## kernels.to_summary()


A JSON-safe digest for callers that cannot take the draws.


Usage

``` python
kernels.to_summary(
    obj,
    *,
    quantiles=DEFAULT_QUANTILES,
)
```


3,571 B against 802,888 B for a 10-target, 10,000-draw distribution - a 225x reduction, and the reason this is a negotiated mode rather than a size threshold: whether a caller gets a distribution or a description of one is the caller's decision to make explicitly.

There is deliberately **no** `from_summary`. A summary is not a distribution and must not be reconstructible into one; that is the whole reason [PredictiveDistribution](kernels.PredictiveDistribution.md#ibnr.kernels.PredictiveDistribution) exists (CLAUDE.md decision 4). A caller who needs draws asks for Arrow.