OneString is a 0 GC ToString solution.

Support expansion, easy to use.

*** FEATURES ***

0 GC：To String takes 0 GC.

0 GC：OneString.Concat takes 0 GC.

Support int、long、float、double、bool, etc.

Support the setting of the number of decimal places, and the default is to keep two decimal places.

Easy to use: Just use ToOneString() function, it will return a string.

Support expansion and modification.

Contains complete code and demo scenarios.