Respect /
Validation
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| ⇢ | A | Nullable added | |
| ⇢ | A | NullableException added |
| ⇢ | A | Nullable::check() added | |
| ⇢ | A | Nullable::assert() added | |
| ⇢ | A | Nullable::validate() added | |
| ⇢ | A | NullableException::chooseTemplate() added |
