Type conversion graph is dependent on evaluation order

[frenchy64]

If java-time requires namespaces in a different order, the conversion graph will be different.

• unit test the current graph
• think about how to maintain the same order eg., prefer-method

[frenchy64]

Idea: warn if java-time has not been created yet in internal namespaces to inform users if they are in danger of nondeterministic results based on their requires of internal namespaces.