Use bcmath for int64/uint64

[kafkiansky]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 82.14286% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.23%. Comparing base (cf0ed0f) to head (183b714).
⚠️ Report is 2 commits behind head on 0.3.x.

Files with missing lines	Patch %	Lines
src/Order.php	82.14%	15 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (cf0ed0f) and HEAD (183b714). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (cf0ed0f)	HEAD (183b714)
	2	1

Additional details and impacted files

@@             Coverage Diff              @@
##              0.3.x       #3      +/-   ##
============================================
- Coverage     96.09%   86.23%   -9.86%     
- Complexity       25       31       +6     
============================================
  Files             2        1       -1     
  Lines           128      109      -19     
============================================
- Hits            123       94      -29     
- Misses            5       15      +10     

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