ES6又提供了三种新方法。

includes()：返回布尔值，表示是否找到了参数字符串。

startsWith()：返回布尔值，表示参数字符串是否在源字符串的头部。

endsWith()：返回布尔值，表示参数字符串是否在源字符串的尾部。

请支持。

Is your feature request related to a problem? Please describe.
Please describe the problem you are trying to solve.

Java configuration functions are mutable.

For example the following setClearAppliedFunctionsOnBoot function is mutable. This function and others should be immutable.

Map<String, Double, PureFunction<String, Double, Apply.Map<Double>>> products =
  PersistentMap
    .functionsOn(Paths.get("my_dir"), stringSerializer(), doubleSerializer(), Arrays.asList(discount))
    .setClear

FEATURE REQUEST

1. Please describe the feature you are requesting.
   We should evaluate to support the "use" command to change the default tablespace in use. Note that right now we do not support multiple schema, but this could change.

2. Indicate the importance of this issue to you (blocker, must-have, should-have, nice-to-have). Are you currently using any workarounds to address this is

https://github.com/BLAKE3-team/BLAKE3