feat(generic): compatible with lossless conversion for int8-64

[wisdomearth]

What type of PR is this?

feat

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• The description of this PR title is user-oriented and clear enough for others to understand.
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泛化调用无损兼容 int8,int16,int32,int64间相互转换

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: Previously, conversion from int32 to int8 and int16 was supported, but lossless conversion between ints was not fully supported.
zh(optional): 之前支持了 int32到int8，int16 的转换，但int之间的无损转换没有完全支持

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(optional) The PR that updates user documentation:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.31%. Comparing base (890b56a) to head (9f9f8c2).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1287      +/-   ##
===========================================
+ Coverage    70.14%   70.31%   +0.16%     
===========================================
  Files          286      286              
  Lines        20676    20723      +47     
===========================================
+ Hits         14503    14571      +68     
+ Misses        4968     4947      -21     
  Partials      1205     1205              

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