Add support for mixed decimal64_fast and Integer operations

[mborland]

Closes: #605

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.81657% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 99.1%. Comparing base (e97e199) to head (9e21836).

Additional details and impacted files

[](https://app.codecov.io/gh/cppalliance/decimal/pull/606?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) ```diff @@ Coverage Diff @@ ## develop #606 +/- ## ========================================= + Coverage 99.1% 99.1% +0.1% ========================================= Files 210 210 Lines 13868 14195 +327 Branches 1566 1608 +42 ========================================= + Hits 13733 14064 +331 + Misses 135 131 -4 ``` | [Files](https://app.codecov.io/gh/cppalliance/decimal/pull/606?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) | Coverage Δ | | |---|---|---| | [test/random\_decimal64\_fast\_comp.cpp](https://app.codecov.io/gh/cppalliance/decimal/pull/606?src=pr&el=tree&filepath=test%2Frandom_decimal64_fast_comp.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-dGVzdC9yYW5kb21fZGVjaW1hbDY0X2Zhc3RfY29tcC5jcHA=) | `100.0% <ø> (ø)` | | | [test/random\_decimal64\_fast\_math.cpp](https://app.codecov.io/gh/cppalliance/decimal/pull/606?src=pr&el=tree&filepath=test%2Frandom_decimal64_fast_math.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-dGVzdC9yYW5kb21fZGVjaW1hbDY0X2Zhc3RfbWF0aC5jcHA=) | `100.0% <100.0%> (ø)` | | | [include/boost/decimal/decimal64\_fast.hpp](https://app.codecov.io/gh/cppalliance/decimal/pull/606?src=pr&el=tree&filepath=include%2Fboost%2Fdecimal%2Fdecimal64_fast.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-aW5jbHVkZS9ib29zdC9kZWNpbWFsL2RlY2ltYWw2NF9mYXN0LmhwcA==) | `98.7% <98.6%> (+3.7%)` | :arrow_up: | ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/cppalliance/decimal/pull/606?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/cppalliance/decimal/pull/606?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). Last update [e97e199...9e21836](https://app.codecov.io/gh/cppalliance/decimal/pull/606?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance).