Almost-Exact Inference for the DerSimonian-Laird Test Statistic // Implements almost-exact inference for the DerSimonian-Laird test statistic in the normal-normal random-effects meta- analysis model, as described in Hanada and Sugimoto (2023) doi:10.1007/s10463-022-00844-4. The method approximates the distribution of the DerSimonian-Laird test statistic by combining the distribution of the untruncated DerSimonian-Laird estimator of the between-study variance with a conditional normal approximation. Methods based on a plug-in between-study variance and a corrected heterogeneity measure are provided.