Runtime Behavior

JSON.internal

JSON.internal.stringify(...) and JSON.internal.parse(...) exist for nested use inside custom serializers and deserializers.

They preserve internal buffer state so nested custom flows do not corrupt the caller’s active slice.

Shared buffer behavior

Serialization uses a shared internal buffer managed by bs.

Recent runtime work tightened:

• nested save/load behavior
• local string scratch slices during deserialization
• field writes from decoded scratch slices

Adaptive buffer sizing

The buffer tracks typical output size with an exponential moving average and can shrink adaptively through JSON.Memory.shrink().