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docs: intro to "Value Conversions" chapter added

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docs/users_guide/framework_basics/value_conversions.md
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# Value Conversions # Value Conversions
One of the most important features of every unit library is to provide support for
compile-time-enabled conversions of a [numerical value of a quantity](../../appendix/glossary.md#numerical-value).
A [numerical value of a quantity](../../appendix/glossary.md#numerical-value) depends on two
elements:
- quantity representation type (e.g., `int`, `double`) that stores the number expressing the amount
of quantity,
- [unit](../../appendix/glossary.md#unit) in which the quantity is being measured.
Changing any of the above may require changing the value stored in a quantity.
## Value-preserving conversions ## Value-preserving conversions
```cpp ```cpp