TinyTree statistics held in static, not in the Configuration
Saxon keeps statistics on the sizes of constructed TinyTree instances in order to learn a good guess at how much initial space to allocate when a new tree is constructed.
These statistics have traditionally been kept in JVM static data, which means they are shared across Configurations. Holding mutable data in static is undesirable for a number of reasons.
This has been fixed on the 9.9 branch to hold the data local to a Configuration.
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