I propose to make j.t.f.DateTimePrintContext immutable.
Currently, DateTimePrintContext has only one mutable field, optional. This can
be replaced by adding an optional parameter to the DateTimeFormatter.formatTo
method.
Immutable DateTimePrintContext can be optimized by escape analysis, such as
immutable object optimization.
In order to make it easier for reviewers to see my ideas, I submitted a draft
Pull Request ( https://github.com/openjdk/jdk/pull/26913
<https://github.com/openjdk/jdk/pull/26913 > ). Please give me feedback.
