[issue36031] add internal API function to effectively convert just created list to tuple

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

-1 This technique has a low payoff (possibly even zero due to memcpy() overhead) but is likely to create future maintenance issues (risk of bugs due to the fragility of assuming a refcnt of one, awkwardness of maintenance if we have to alter the surrounding code).

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nosy: +rhettinger

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<https://bugs.python.org/issue36031>
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