How to resolve “error whilst” resolving message after updating library?

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Summary This incident describes a common Node.js dependency resolution failure—specifically an ERESOLVE conflict—occurring after attempting to update libraries in a React Native project. The error specifically highlights a peer dependency mismatch between @react-navigation/drawer and @react-navigation/native. Problem: npm 7+ enforces strict peer dependency checking. Conflict: The installed version of @react-navigation/native (v6.1.18) does not satisfy the peer … Read more

Pandas rename() not working on MultiIndex columns with tuples

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Summary The user reported a problem where pandas.DataFrame.rename(columns=…) fails to rename MultiIndex columns defined by tuples. The root cause is that pandas rename() does not support a tuple-based mapping for MultiIndex columns in the dictionary format. While pandas 2.2.0 introduced support for passing a callable to the columns argument for MultiIndex renaming, passing a dictionary … Read more

Declaring member variables in a class interface header file

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Summary The question revolves around the declaration of member variables in a C++ class interface header file. Key concepts include understanding the difference between declaration and initialization, as well as the proper use of references and pointers as class members. The provided example includes a class OCR with members such as a reference to an … Read more

dangerous relocation: unsupported relocation (R_ARM_SBREL32)

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Summary The postmortem analyzes a compilation failure on an ARM Cortex-M0+ project, where the linker flags a relocation type R_ARM_SBREL32 as “dangerous” and “unsupported.” The issue occurs because the developer used the -frwpi flag, which stands for Read-Only Write-Once Pointer Initialization. This flag is designed for a specific code model that requires the linker to … Read more

Theoretical results on performance bounds for virtual machines and bytecode interpreters

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Summary This postmortem analyzes the theoretical performance bounds of virtual machines (VMs) and bytecode interpreters relative to native instruction execution. The core finding is that while interpreters introduce unavoidable overhead, modern techniques like Just-In-Time (JIT) compilation and efficient dispatch methods narrow the gap significantly. The “2x/3x slowdown” observed in WASM is not a universal theoretical … Read more

Custom SpinLock implementation

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Summary A developer attempted to implement a custom SpinLock in Rust based on Mara Bos’s book to protect shared mutable state across threads. The code resulted in memory safety issues (segmentation faults or undefined behavior) because the raw SpinLock was used to guard an UnsafeCell containing a String without adhering to Rust’s strict concurrency safety … Read more

Projecting a Text onto a wave Like Loft Prior tobextrude it

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Summary A user attempted to project text onto a complex, wave-like surface generated in Grasshopper (a Rhino plugin) but encountered difficulties using the Surface Morph component. The core issue was attempting to use a single Loft surface to describe a compound geometry formed by pipes and connecting bows. Surface Morph requires a valid U-V coordinate … Read more

Error while importing strawberry-graphql library

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Summary The issue encountered is an incompatibility between the installed strawberry-graphql library and the pydantic library. The error message indicates that strawberry-graphql is trying to import from pydantic.v1.utils, but the installed version of pydantic is 2.5.3. Root Cause The root cause of the issue is: Incompatible library versions: The installed version of pydantic is 2.5.3, … Read more

Pango passes wrong glyph indices to custom renderer

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Summary We encountered a production rendering issue where a custom Pango renderer displayed incorrect glyphs. Instead of rendering the correct characters, the PangoGlyph indices passed to our draw_glyphs function were misaligned with the actual font mapping. For example, a lowercase ‘c’ (ASCII 99) resulted in a glyph index of 102 (ASCII ‘f’). This behavior was … Read more