update:浮点数之间的等值判断，基本数据类型不能用==来比较，包装数据类型不能用equals来判断。

[TomYule]

update:浮点数采用“尾数+阶码”的编码方式，类似于科学计数法的“有效数字+指数”的表示方式。二进制无法精确表示大部分的十进制小数，具体原理参考《码出高效》

[codecov-io]

Codecov Report

Merging #1523 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1523      +/-   ##
==========================================
+ Coverage   47.63%   47.65%   +0.01%     
==========================================
  Files         866      866              
  Lines       36243    36243              
  Branches     7831     7831              
==========================================
+ Hits        17266    17270       +4     
+ Misses      16692    16689       -3     
+ Partials     2285     2284       -1

Impacted Files	Coverage Δ
src/org/nutz/lang/util/FloatRange.java	80% <100%> (ø)	⬆️
src/org/nutz/lang/random/ListRandom.java	94.44% <0%> (+22.22%)	⬆️

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